2. The module of claim 1, wherein the second lateral range is greater than the first lateral range and the second normal range is substantially equal to the first normal range.

3. The module of claim 1, wherein the second male guide type is different from the first male guide type.

4. The module of claim 1, wherein the first rear height is substantially the same as the first forward height, the second rear height is substantially the same as the second forward height, and the third rear height is substantially the same as the third forward height.

5. The module of claim 1, further comprising: a forward male guide extension of the first male guide type removably mounted above the first front support such that the forward male guide extension is in alignment with the forward male guide; and a rear male guide extension of the second male guide type removably mounted above the first rear support such that the rear male guide extension is in alignment with the rear male guide.

6. The module of claim 1, the first male guide type comprising a first male guide shape having a first trapezoidal cross-section, a respective outer face and respective sides angled inward at a first angle relative to the outer face; the first female guide type comprising a respective channel portion having a bottom and sides angled inward at the first angle relative to the bottom; the second male guide type comprising a second male guide shape having a second trapezoidal cross-section, a respective outer face and respective sides angled inward at a second angle relative to the outer face, the second angle being less than the first angle; and the second female guide type comprising a respective channel portion having a bottom and sides angled inward at the second angle relative to the bottom.

7. The module of claim 6, wherein the first angle is substantially 45 degrees and the second angle is substantially 30 degrees.

8. The module of claim 1, further comprising a fa ade panel mounted to the front side of the module.

9. A method for assembling a modular building comprising the steps of:

(a) providing a plurality of building modules including a placed module positioned on a substrate and a new module to be positioned on the substrate adjacent to and in alignment with the placed module, each respective module comprising: a framework defining a top and a bottom of the module, first front supports and second front supports defining a front side of the module, first rear supports and second rear supports defining a rear side of the module, wherein the first front supports and the first rear supports define a first side of the module and the second front support and the second rear support define a second side of the module, each of the first supports and the second supports having a respective top end and a bottom end; a forward male guide on the first side of the respective module and extending along the first front support from a first forward height above the bottom of the respective module and upwards towards the top of the respective module; a rear male guide on the first side of the respective module and extending along the first rear support from a first rear height above the bottom of the respective module and extending upwards towards the top of the respective module; a forward upper female guide on the second side of the respective module and positioned along the second front support at a second forward height above the bottom of the respective module and a forward lower female guide on the second side of the respective module and positioned along the second front support at a third forward height above the bottom of the respective module, wherein the second forward height is less than the first forward height and the third forward height is less than the second forward height; a rear upper female guide on the second side of the respective module and positioned along the second front support at a second rear height above the bottom of the respective module and a rear lower female guide on the second side of the respective module and positioned along the second front support at a third rear height above the bottom of the respective module, wherein the second rear height is less than the first rear height and the third rear height is less than the second rear height; the forward male guide being of a first male guide type, the rear male guide being of a second male guide type, the forward upper female guide and forward lower female guide each being of a first female guide type, the rear upper female guide and rear lower female guide each being of a second female guide type;

(b) placing the new module in an initial position above the substrate where the bottom of the new module is above the top of the placed module and the first side of the placed module is horizontally adjacent to the second side of the new module;

(c) lowering the new module from the initial position to a first position above the substrate in which the forward lower female guide of the new module engages the forward male guide of the placed module and the rear lower female guide of the new module engages the rear male guide of the placed module; and

(d) lowering the new module from the first position to a second position above the substrate in which the forward upper female guide of the new module engages the forward male guide of the placed module and the rear upper female guide of the new module engages the rear male guide of the placed module; wherein the first male guide type and first female guide type are compatible and configured such that when a respective first male guide of the first male guide type is engaged with a respective first female guide of the first female guide type, motion of the respective first male guide relative to the respective first female guide is constrained along a lateral axis of the respective first female guide by a first lateral range and along a normal axis of the respective first female guide by a first normal range; and wherein the second male guide type and second female guide type being compatible and configured such that when a respective second male guide of the second male guide type is engaged with a respective second female guide of the second female guide type, motion of the respective second male guide relative to the respective second female guide is constrained along a lateral axis of the respective second female guide by a second lateral range and along a normal axis of the respective second female guide by a second normal range.

10. The method of claim 9, wherein the first rear height is substantially the same as the first forward height, the second rear height is substantially the same as the second forward height, and the third rear height is substantially the same as the third forward height.

11. The method of claim 9, further comprising the step (e) of lowering the new module from the second position to a third position above the substrate where the forward upper female guide is at a height above the substrate less than the first forward height and the rear upper female guide is a height above the substrate less than the first rear height, wherein in the third position the forward upper female guide of the new module is disengaged from the forward male guide of the placed module and the rear upper female guide of the new module is disengaged from the rear male guide of the placed module.

12. The method of claim 11, further comprising the steps of: prior to the step of lowering the new module from the initial position to a first position, mounting an alignment pin to the substrate, the alignment pin positioned on the substrate an intended horizontal position of an alignment hole in the bottom of the new module when the new module is installed; and after the step (e) of lowering the new module from the second position to the third position, lowering the new module from the third position to a placed position on the substrate, wherein the alignment pin is engaged within the alignment hole while the new module is lowered from the third position to the placed position.

13. The method of claim 9, further comprising the steps of: prior to placing the new module in the initial position, mounting a forward male guide extension of the first male guide type above the first front support of the placed module such that the forward male guide extension is in alignment with the forward male guide of the placed module, and mounting a rear male guide extension of the second male guide type above the first rear support of the placed module such that the rear male guide extension is in alignment with the rear male guide of the front support; wherein during the step of lowering the new module from the initial position to the first position, the forward male guide extension engages the forward lower female guide of the new module engages and the rear male guide extension engages the rear lower female guide of the new module.

14. The method of claim 13, further comprising the step of removing the forward male guide and the rear male guide from the placed module after the new module is positioned on the substrate.

15. The method of claim 9, wherein the first male guide type comprises a male guide shape having a first trapezoidal cross-section, a respective outer face and respective sides angled inward at a first angle relative to the outer face; the first female guide type comprises a respective channel portion having a bottom and sides angled inward at the first angle relative to the bottom; the second male guide type comprises a male guide shape having a second trapezoidal cross-section, a respective outer face and respective sides angled inward at a second angle relative to the outer face, the second angle being less than the first angle; and the second female guide type comprises a respective channel portion having a bottom and sides angled inward at the second angle relative to the bottom.

16. The method of claim 15, wherein the first angle is substantially 45 degrees and the second angle is substantially 30 degrees.

17. The method of claim 9, the plurality of modules further comprising an additional module to be positioned on the substrate adjacent to and in alignment with the new module, the method further comprising, after the new module is positioned on the substrate adjacent to and in alignment with the placed module, repeating steps (b), (c) and (d) with the new module being treated as the placed module and the additional module being treated as the new module.

18. A system for use in positioning a prefabricated building module on a substrate of a modular building, the system comprising: a first module, a first pilot, and a second pilot; the first module comprising: a framework defining a top and a bottom of the first module, first front supports and second front supports defining a front side of the first module, first rear supports and second rear supports defining a rear side of the first module, wherein the first front supports and the first rear supports define a first side of the first module and the second front support and the second rear support define a second side of the first module; a first male block on a lower front corner of the first side of the first module adjacent the first front supports and having a respective length, width, top, and bottom, the top of the first male block being a first extension distance above the base of the first module; and a second male block on a lower corner of the rear side of the first module adjacent the second side and having a respective length, width, top, and bottom, the top of the second male block being a second male block distance above the base of the first module; the first pilot comprising: 70 a respective base and a respective side with a first female channel therein extending away from the respective base along a respective channel axis starting at a first channel start and ending at a first channel end; the first female channel having a respective channel bottom and opposed channel sides that define a respective channel opening; the base of the first pilot configured to be removably mounted to the substrate with the first channel axis extending vertically from the substrate when so mounted; and the second pilot comprising : a respective base and a respective side with a second female channel therein extending away from the respective base along a respective channel axis starting at a second channel start and ending at a second channel end; the second female channel having a respective channel bottom and opposed channel sides that define a respective channel opening, a respective outward axis of the second female channel being perpendicular to the channel axis of the second female channel and passing between the respective opposed channel sides and through the channel opening; the base of the second pilot configured to be removably mountable to the substrate with the second channel axis extending vertically from the substrate when so mounted; the first and second female channels each having a respective normal axis perpendicular to the respective channel axis of the respective channel and passing between the respective opposed channel sides and through the respective channel opening, and a respective lateral axis that is perpendicular to the respective channel axis and the respective normal axis; the first male block and first female channel configured so that when the first male block is engaged within the first female channel, a position of the first male block in the first female channel is constrained to a first normal range along the normal axis of the first female channel and to a first lateral range along the lateral axis of the first female channel, and wherein disengagement of the first male block from the first female channel requires relative motion of the first male block along the respective channel axis; 71 the second male block and second female channel are configured so that when the second male block is engaged within the second female channel, the second male block can freely move outward from the second female channel along the normal axis of the second female channel and a position of the second male block in the second female channel is constrained to a second lateral range along the lateral axis of the second female channel; the first male block distance being greater than a height of the first channel start above the substrate when the first pilot is removably mounted to the substrate, and the second male block distance being greater than a height of the second channel start above the substrate when the second pilot is removably mounted to the substrate; and wherein the first pilot is mounted to the substrate adjacent a desired placement point of the lower front corner of the first side of the first module and the second pilot is mounted to the substrate adjacent a desired placement point of the lower corner of the rear side of the first module, interaction between the first male block and first male channel and between the second male block and second male channel as the first module is lowered towards the substrate aligns a position of the first module.

19. The system of claim 18, the first male block having first trapezoidal cross-section with a respective outer face and respective sides angled inward at a first angle relative to the respective outer face,, the opposed channel sides of the first female channel angled inward at the first angle relative to the bottom of the first female channel, the first angle being less than 90 degrees; and the second male block having a substantially rectangular cross-section with a width of the male block less than a width of the channel opening of the second female channel.

20. The system of claim 19, wherein the first angle is substantially 45 degrees.

21. The system of claim 18, the first module having an alignment aperture in bottom; the system further comprising an alignment pin having a top and being mountable to the substrate and configured to engage the alignment aperture, the alignment pin configured so that when the alignment pin, first pilot, and second pilot are mounted to the substrate, a height of the 72 top of the alignment pin over the substrate is greater than at least one of the height of the first channel start above the substrate and the height of the second channel start above the substrate.

22. The system of claim 18, further comprising: a forward male guide on the first side of the first module and extending along the first front support from a first height above the bottom of the first module and upwards towards the top of the first module; and a rear male guide on the first side of the first module and extending along the first rear support from the first height above the bottom of the first module and extending upwards towards the top of the first module.

23. The system of claim 22, further comprising a second module; the second module having a respective framework defining a top and a bottom of the second module, respective first front supports and second front supports defining a front side of the second module, respective first rear supports and second rear supports defining a rear side of the second module, wherein the respective first front supports and the first rear supports define a first side of the second module and the respective second front support and the second rear support define a second side of the second module, each of the first supports and the second supports having a respective top end and a bottom end; a forward female guide on the second side of the second module and positioned along the respective second front support at a second height above the bottom of the second module, wherein the second height is less than the first height, the female guide and on the second module being compatible with the forward male guide on the first module; a rear female guide on the second side of the second module and positioned along the respective second rear support at the second height above the bottom of the second module, the rear female guide on the second module being compatible with the rear male guide on the first module; wherein when the first module is positioned on the substrate and the second module is positioned on the substrate in alignment with the first module and with the second side of the second module adjacent the first side of the first module, the second module can be lowered such that the forward male guide on the first module engages forward female guide on the second 73 module to guide and align the second front support of the second module with the first front support of the first module, and the rear male guide on the first module engages the rear female guide on the second module to guide and align the second rear support of the second module with the first rear support of the first module.

24. A method for positioning a prefabricated building module on a substrate of a modular building, the method comprising the steps of:

(a) providing a first module, a first pilot, and a second pilot; the first module comprising: a framework defining a top and a bottom of the first module, first front supports and second front supports defining a front side of the first module, first rear supports and second rear supports defining a rear side of the first module, wherein the first front supports and the first rear supports define a first side of the first module and the second front support and the second rear support define a second side of the first module; a first male block on a lower front corner of the first side of the first module adjacent the first front supports and having a respective length, width, top, and bottom, the top of the first male block being a first extension distance above the base of the first module; and a second male block on a lower corner of the rear side of the first module adjacent the second side and having a respective length, width, top, and bottom, the top of the second male block being a second male block distance above the base of the first module; the first pilot comprising: a respective base and a respective side with a first female channel therein extending away from the respective base along a respective channel axis starting at a first channel start and ending at a first channel end; the first female channel having a respective channel bottom and opposed channel sides that define a respective channel opening; 74 the base of the first pilot configured to be removably mounted to the substrate with the first channel axis extending vertically from the substrate when so mounted; and the second pilot comprising: a respective base and a respective side with a second female channel therein extending away from the respective base along a respective channel axis starting at a second channel start and ending at a second channel end; the second female channel having a respective channel bottom and opposed channel sides that define a respective channel opening, a respective outward axis of the second female channel being perpendicular to the channel axis of the second female channel and passing between the respective opposed channel sides and through the channel opening; the base of the second pilot configured to be removably mountable to the substrate with the second channel axis extending vertically from the substrate when so mounted; the first and second female channels each having a respective normal axis perpendicular to the respective channel axis of the respective channel and passing between the respective opposed channel sides and through the respective channel opening, and a respective lateral axis that is perpendicular to the respective channel axis and the respective normal axis; the first male block and first female channel configured so that when the first male block is engaged within the first female channel, a position of the first male block in the first female channel is constrained to a first normal range along the normal axis of the first female channel and to a first lateral range along the lateral axis of the first female channel, and wherein disengagement of the first male block from the first female channel requires relative motion of the first male block along the respective channel axis; the second male block and second female channel are configured so that when the second male block is engaged within the second female channel, the second male block can freely move outward from the second female channel along the normal axis of the second female channel and a position of the second male block in the second female channel is constrained to a second lateral range along the lateral axis of the second female channel; 75

(b) removably mounting the first pilot on the substrate adjacent a desired placement point of the lower front corner of the first side of the first module;

(c) removably mounting the second pilot on the substrate adjacent a desired placement point of the lower corner of the rear side of the first module;

(d) positioning the first module in an initial position above the substrate where the bottom of the first male block is above the top of the first female channel and the bottom of the second male block is above the top of the second female channel; and

(e) lowering the first module from the initial position to a first position above the substrate in which the first male block engages the first female and the second male block engages the second channel, wherein interaction between the first male block and first male channel guides and aligns the first forward support of the first module and interaction between the second male block and second male channel guides and aligns the second rear support of the first module.

25. The method of claim 24, further comprising the steps of: lowering the first module from the first position to a second position above the substrate where the top of the first male block is lower than the first channel start and the top of the second male block is lower than the second channel start.

26. The method of claim 25, further comprising the steps of: mounting an alignment pin to the substrate, the alignment pin positioned on the substrate an intended horizontal position of an alignment hole in the bottom of the first module when the first module is installed; and lowering the first module from the second position to a placed position on the substrate, wherein the alignment pin is engaged within the alignment hole while the new module is lowered from the second position to the placed position.

27. The method of claim 24, the first male block having first trapezoidal cross-section with a respective outer face and respective sides angled inward at a first angle relative to the respective 76 outer face, the opposed channel sides of the first female channel angled inward at the first angle relative to the bottom of the first female channel, the first angle being less than 90 degrees; and the second male block having a substantially rectangular cross-section with a width of the male block less than a width of the channel opening of the second female channel.

28. The method of claim 27, wherein the first angle is substantially 45 degrees.

29. The method of claim 24, further comprising the steps of: lowering the first module from the first position to a placed position on the substrate; and removing the first pilot and second pilot from the substrate.

30. The method of claim 29, the first module further comprising a forward male guide on the first side of the first module and extending along the first front support from a first height above the bottom of the first module and upwards towards the top of the first module, and a rear male guide on the first side of the first module and extending along the first rear support from the first height above the bottom of the first module and extending upwards towards the top of the first module the method further comprising the steps of: providing a second module, wherein the second module comprises: a respective framework defining a top and a bottom of the second module, respective first front supports and second front supports defining a front side of the second module, respective first rear supports and second rear supports defining a rear side of the respective second module, wherein the respective first front supports and the first rear supports define a first side of the second module and the respective second front support and the second rear support define a second side of the second module, each of the first supports and the second supports having a respective top end and a bottom end; a forward female guide on the second side of the second module and positioned along the respective second front support at a second height above the bottom of the second module, wherein the second height is less than the first height, the female guide and on the second module being compatible with the forward male guide on the first module; and 77 a rear female guide on the second side of the second module and positioned along the respective second rear support at the second height above the bottom of the second module, the rear female guide on the second module being compatible with the rear male guide on the first module; after the steps of lowering the first module to the placed position on the substrate and removing the first pilot and second pilot: positioning the second module over the substrate with the bottom of the second module above the top of the first module and with the second side of the second module in alignment with the first side of the first module; and lowering the second module such that the forward male guide on the first module engages the forward female guide on the second module to guide and align the second front support of the second module with the first front support of the first module, and the rear male guide on the first module engages the rear female guide on the second module to guide and align the second rear support of the second module with the first rear support of the first module.

31. A system for use in placing a first module on a substrate of a modular building and in alignment with a placed module already positioned on the substrate, each respective module having a top and a bottom, first front supports and second front supports defining a front side of the respective module, first rear supports and second rear supports defining a rear side of the respective module, wherein the first front support and the first rear support define a first side of the respective module and the second front support and the second rear support define a second side of the respective module, and each respective module having substantially the same height, the first module to be placed with the first module back adjacent the placed module back and where the first side of the placed module is in alignment with the second side of the first module, the system comprising: the first module, a first pilot, a second pilot, and a third pilot; the first module comprising; a first male guide on the back side adjacent the first side of the first module; a second male guide on the back side adjacent the second side of the first module; and 78 a male guide block on a lower front corner of the first side adjacent the front side of the of the first module; each respective pilot comprising a respective base and front side, a respective female guide the respective female guide comprising a female channel having opposed channel sides and a channel base, and extending upward on the front side along a channel axis from a channel start to a channel end, the channel end being further from the base than the channel start, each respective female guide having a respective normal axis perpendicular to the respective channel axis and passing between the respective opposed channel sides and through the respective channel opening, and a respective lateral axis that is perpendicular to the respective channel axis and the respective normal axis; the first male guide and the male guide block being of a first male guide type, the second male guide having a lower portion from a bottom of the guide to a transition point a first height above the base of the first module, and an upper portion from the transition point to the top of the second male guide, the lower portion being of a second male guide type and the upper portion being of a third male guide type; the first pilot female channel and third pilot female channel being of a first female guide type; the second pilot female channel being of a second female guide type; the first male guide type and first female guide type being compatible and configured to constrain motion of a respective first male guide of the first male guide type engaged with a respective first female guide of the first female guide type along a lateral axis of the respective first female guide to first lateral range and along a normal axis of the respective first female guide to a first normal range; the second male guide type and second female guide type being compatible and configured to constrain motion of a respective second male guide of the second male guide type engaged with a respective second female guide of the second female guide type along a lateral axis of the respective second female guide to second lateral range and along a normal axis of the respective second female guide to a second normal range; the third male guide type being configured such that when a respective third male guide of the third male guide type is engaged with a respective second female guide of the second 79 female guide type, motion of the respective third male guide relative to respective second female guide is constrained along the lateral axis of the respective second female guide to a third lateral range, and the respective third male guide can freely move outward from the respective second female channel long along the normal axis of the respective second female channel. the first lateral range being is greater than the second lateral range; wherein, when the first pilot is mounted on the top of the placed module at the back corner adjacent the second side of the placed module, the second pilot is mounted on the top of the placed module at the back corner adjacent the second side of the placed module, and the third pilot is mounted on the substrate adjacent a desired placement point of the lower front corner of the second side of the first module, the first module is positionable:

(a) in first position relative to the placed module where the bottom of the first module is above the top of the placed module, and in which the first male guide is engaged in the first pilot female channel, and the lower portion of the second male guide is engaged in the second pilot female channel, interaction between the first male guide and first pilot aligning a position of the first rear vertical support of the first module relative to the placed module, and the interaction between the lower part of the second male guide and second pilot aligning a position of the second rear vertical support of the first module relative to the placed module; and

(b) from the first position to a second position relative to the placed module where the transition point of the second male guide is below the bottom of the first module, and in which a top of the first male guide is lower than the first pilot, the upper portion of the second male guide is engaged in the second pilot female channel, and the male guide block is engaged in the third pilot female channel, interaction between the upper portion of the second male guide and second pilot aligning the position of the second rear vertical support of the first module relative to the placed module, and interaction between the male guide block and the third pilot aligning the position of the lower front corner of the first side relative to a predefined horizontal position relative to the substrate.

32. The system of claim 31, wherein a height of the channel start of the third pilot female channel above the base of the third pilot is greater than the height of the top of the male block guide block above the bottom of the first module; 80 wherein when the first pilot is mounted on the top of the placed module at the back corner adjacent the second side of the placed module, the second pilot is mounted on the top of the placed module at the back corner adjacent the second side of the placed module, and the third pilot is mounted on the substrate adjacent a desired placement point of the lower front corner of the second side of the first module, the first module is positionable from the second position to a third position in which the top of the male guide block is lower than the channel start of the third pilot female channel.

33. The system of claim 31 , wherein the first normal range and second normal range are substantially the same and less than the first lateral range; and the first lateral range, second lateral range, and third lateral range are substantially the same.

34. The system of claim 33, the first male guide type comprising a first male guide shape having a first trapezoidal cross-section, a respective outer face and respective sides angled inward at a first angle relative to the outer face; the first female guide type comprising a respective first channel portion shape having a respective bottom and sides angled inward at the first angle relative to the respective bottom; the second male guide type comprising a second male guide shape having a second trapezoidal cross-section, a respective outer face and respective sides angled inward at a second angle relative to the outer face, the second angle being less than the first angle; the second female guide type comprising a respective second channel portion shape having a respective bottom and sides angled inward at the second angle relative to the respective bottom; the third male guide type comprising a third male guide shape having a rectangular cross- section.

35. The system of claim 34, wherein the first angle is substantially 30 degrees and the second angle is substantially 45 degrees. 81

36. The system of claim 31, further comprising an alignment pin having a top and being mountable to the substrate and configured to engage an alignment aperture in the bottom of the building.

37. The system of claim 31, further comprising; a forward male guide on the first side of the first module and extending along the first front support from a forward male guide height above the bottom of the first module and upwards towards the top of the first module; a rear male guide on the first side of the first module and extending along the first rear support from a rear male guide height above the bottom of the first module and extending upwards towards the top of the first module.

38. The system of claim 37, further comprising: a second module, a forward female guide on the second side of the second module and positioned along the respective second front support at a height above the bottom of the second module that is less than the forward male guide height, the forward female guide on the second module being compatible with the forward male guide on the first module; a rear female guide on the second side of the second module and positioned along the respective second rear support at the height above the bottom of the second module that is less than there rear male guide height, the forward female guide on the second module being compatible with the forward male guide on the first module; wherein when the first module is positioned on the substrate and the second module is positioned on the substrate in alignment with the first module and with the second side of the second module adjacent the first side of the first module, the second module can be lowered such that the forward male guide on the first module engages forward female guide on the second module to guide and align the second front support of the second module with the first front support of the first module, and the rear male guide on the first module engages the rear female guide on the second module to guide and align the second rear support of the second module with the first rear support of the first module. 82

39. The system of claim 31, further comprising a facade panel mounted to the front of the first module and a facade panel mounted to the second side of the first module.

40. A method for placing a first module on a substrate of a modular building and in alignment with a placed module already positioned on the substrate, each respective module having a top and a bottom, first front supports and second front supports defining a front side of the respective module, first rear supports and second rear supports defining a rear side of the respective module, wherein the first front support and the first rear support define a first side of the respective module and the second front support and the second rear support define a second side of the respective module, and each respective module having substantially the same height, the first module to be placed with the first module back adjacent the placed module back and where the first side of the placed module is in alignment with the second side of the first module, the method comprising the steps of:

(a) providing the first module, a first pilot, a second pilot, and a third pilot; wherein the first module comprises; a first male guide on the back side adjacent the first side of the first module; a second male guide on the back side adjacent the second side of the first module; and a male guide block on a lower front corner of the first side adjacent the front side of the of the first module; wherein each respective pilot comprises a respective base and front side, a respective female guide the respective female guide comprising a female channel having opposed channel sides and a channel base, and extending upward on the front side along a channel axis from a channel start to a channel end, the channel end being further from the base than the channel start, each respective female guide having a respective normal axis perpendicular to the respective channel axis and passing between the respective opposed channel sides and through the respective channel opening, and a respective lateral axis that is perpendicular to the respective channel axis and the respective normal axis; 83 wherein the first male guide and the male guide block are of a first male guide type, the second male guide has a lower portion from a bottom of the guide to a transition point a first height above the base of the first module, and an upper portion from the transition point to the top of the second male guide, the lower portion being of a second male guide type and the upper portion being of a third male guide type, the first pilot female channel and third pilot female channel are of a first female guide type, and the second pilot female channel being of a second female guide type;

(b) mounting the first pilot is mounted on the top of the placed module at the back corner adjacent the second side of the placed module and mounting the second pilot is mounted on the top of the placed module at the back corner adjacent the second side of the placed module, and mounting the third pilot on the substrate adjacent a desired placement point of the lower front corner of the second side of the first module;

(c) positioning the first module in first position relative to the placed module where the bottom of the first module is above the top of the placed module, and in which the first male guide is engaged in the first pilot female channel, and the lower portion of the second male guide is engaged in the second pilot female channel, wherein interaction between the first male guide and first pilot aligns a position of the first rear vertical support of the first module relative to the placed module, and interaction between the lower part of the second male guide and second pilot aligns a position of the second rear vertical support of the first module relative to the placed module; and

(d) lowering the first module from the first position to a second position relative to the placed module where the transition point of the second male guide is below the bottom of the first module, and in which a top of the first male guide is lower than the first pilot, the upper portion of the second male guide is engaged in the second pilot female channel, and the male guide block is engaged in the third pilot female channel, wherein interaction between the upper portion of the second male guide and second pilot aligns the position of the second rear vertical support of the first module relative to the placed module, and interaction between the male guide 84 block and the third pilot aligns the position of the lower front corner of the first side relative to a predefined horizontal position relative to the substrate.

41. The method of claim 40, the first male guide type and first female guide type being compatible and configured to constrain motion of a respective first male guide of the first male guide type engaged with a respective first female guide of the first female guide type along a lateral axis of the respective first female guide to first lateral range and along a normal axis of the respective first female guide to a first normal range; the second male guide type and second female guide type being compatible and configured to constrain motion of a respective second male guide of the second male guide type engaged with a respective second female guide of the second female guide type along a lateral axis of the respective second female guide to second lateral range and along a normal axis of the respective second female guide to a second normal range; the third male guide type being configured such that when a respective third male guide of the third male guide type is engaged with a respective second female guide of the second female guide type, motion of the respective third male guide relative to respective second female guide is constrained along the lateral axis of the respective second female guide to a third lateral range, and the respective third male guide can freely move outward from the respective second female channel long along the normal axis of the respective second female channel; and the first lateral range is greater than the second lateral range; the first normal range and second normal range are substantially the same and less than the first lateral range; and the first lateral range, second lateral range, and third lateral range are substantially the same.

42. The method of claim 40, a height of the channel start of the third pilot female channel above the base of the third pilot is greater than the height of the top of the male block guide block above the bottom of the first module, the method further comprising the step of:

(e) lowering the first module from the second position to a third position in which the top of the male guide block is lower than the channel start of the third pilot female channel. 85

43. The method of claim 42, further comprising the steps of: prior to the step of lowering the first module from the initial position to a first position, mounting an alignment pin to the substrate, the alignment pin positioned on the substrate an intended horizontal position of an alignment hole in the bottom of the first module when the first module is installed; and after the step (e) of lowering the first module from the second position to the third position, lowering the first module from the third position to a placed position on the substrate, wherein the alignment pin is engaged within the alignment hole while the first module is lowered from the third position to the placed position.

44. A system for use in placing a new module on a substrate of a modular building and in alignment with a first module already positioned on the substrate and a second module already position on the substrate, each respective module having a top and a bottom, first front supports and second front supports defining a front side of the respective module, first rear supports and second rear supports defining a rear side of the respective module, wherein the first front support and the first rear support define a first side of the respective module and the second front support and the second rear support define a second side of the respective module, and each respective module having substantially the same height, the system comprising: an upper female guide of a first female guide type on the second side of the new module positioned along the second front support at a first height above the bottom of the new module and a lower female guide of the first female guide type on the second side of the new module and positioned along the second front support at a second height above the bottom of the new module, the second height lower than the first height; a male guide of a first male guide type on the first side of the second module adjacent the front of the second module, the male guide extending upwards from a height above the bottom of first module to substantially the top of the first module; the first male guide type and first female guide type being compatible configured so that when the male guide on the first module is engaged with a respective upper or lower female guide a position of the male guide relative to the respective female guide is constrained along a 86 lateral axis of the respective first female guide to first lateral range and along a normal axis of the respective female guide to a first normal range; a rectangular male guide on a bottom corner of the rear side adjacent the first side of the new module, the male guide extending vertically upwards from a from a start a third height above the bottom of the new module to an end a fourth height above the bottom of the new module; a rectangular female guide on the rear of the first module adjacent the second side and extending vertically upwards along a respective guide axis from a fifth height above the bottom of the first module; the rectangular male guide being compatible with the rectangular female guide such that when the rectangular male guide is engaged with the rectangular female guide motion of the rectangular male guide relative to the rectangular female guide is constrained along a lateral axis of the rectangular female guide to a second lateral range, wherein when the new module is positioned so the bottom of the new module is above the top of the first module and the top of the second module, the second side of the new module is horizontally adjacent the first side of the first module, and the rear side of the new module is horizontally adjacent the rear side of the second module:

(a) the new module can be lowered to a first position in which the lower female guide on the new module is engaged by the male guide on the first module and the rectangular male guide on the new module is engaged with the rectangular female guide on the second module, interaction between the lower female guide on the new module and the male guide on the first module aligning a position of the second front support of the new module relative to the first front support of the first module, interaction between the rectangular male guide and rectangular female guide aligning a position of the first rear support of the new module with the second rear support of the second module ; and

(b) the new module can be lowered from the first position to a second position in which the upper female guide on the new module is engaged by the male guide on the first module and the rectangular male guide on the new module is engaged with the rectangular female guide on the second module, interaction between the upper female guide on the new module and the male guide on the first module aligning the position of 87 the second front support of the new module relative to the first front support of the first module, interaction between the rectangular male guide and rectangular female guide aligning the position of the first rear support of the new module with the second rear support of the second module.

45. The system of claim 45, wherein the first lateral range and the second lateral range are substantially the same

46. The system of claim 45, further comprising; a first pilot having a respective base and a respective side with a male guide of the first male guide type therein extending upwards from the respective base, the first pilot configured to be mountable on the top of the first module with the first pilot male guide in alignment with the male guide on the first module; and a second pilot having a respective base and a respective side with a rectangular female guide therein extending upwards from the respective base, the second pilot configured to be mountable on the top of the second module with the second pilot rectangular female guide in alignment with the rectangular female guide on the second module.

47. The system of claim 46, further comprising an alignment pin mountable to the substrate and configured to engage an alignment aperture in the bottom of the new module when the new module is lowered from the second position to a placement position on the substrate.

48. The system of claim 1, wherein a respective pair of (i) the forward upper female guide and forward lower female guide or (ii) the rear upper female guide and rear lower female guide is comprised of a respective upper female guide portion at a top of an elongated female guide and a respective lower female guide portion at a bottom of the elongated female guide.

49. The method of claim 9, wherein a respective pair of (i) the forward upper female guide and forward lower female guide or (ii) the rear upper female guide and rear lower female guide is comprised of a respective upper female guide portion at a top of an elongated female guide and a respective lower female guide portion at a bottom of the elongated female guide. 88

50. The system of claim 45, the upper female guide and lower female guide is comprised of a respective upper female guide portion at a top of an elongated female guide and a respective lower female guide portion at a bottom of the elongated female guide.