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 module and extending along the first front support from a first forward height above the bottom of the module and upwards towards the top of the module;

a rear male guide on the first side of the module and extending along the first rear support from a first rear height above the bottom of the module and extending upwards towards the top of the module;

a forward upper female guide on the second side of the module and positioned along the second front support at a second forward height above the bottom of the module and a forward lower female guide on the second side of the module and positioned along the second front support at a third forward height above the bottom of the module, wherein the second forward height is shorter than the first forward height and the third forward height is shorter than the second forward height;

a rear upper female guide on the second side of the module and positioned along the second rear support at a second rear height above the bottom of the module and a rear lower female guide on the second side of the module and positioned along the second rear support at a third rear height above the bottom of the module, wherein the second rear height is shorter than the first rear height and the third rear height is shorter 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;

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 position of a respective second male guide 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.