Multi Size Stackable Gridfinity Boxes

MAJOR UPDATE:After receiving excellent community feedback, I have revised the boxes to make the following changes:The box heights are now listed including the lid height. In the previous version, the height described the box without the lid. This also meant that the actual height to the base of the lid wasn't an exact Gridfinity unit. The box height has been slightly adjusted, but effectively what used to be a “3U” box is now listed as a 4U box including the lid. Please see the new size guid