From the start we chose the rhomboid geometry that is made up of identical parallelograms. Just like with squares and rectangles, parallelograms can be made up of rectangular sheathing without wasting any of it.
Here is a demonstration: typically, our standard roof panels can be made up of two 4x8 sheets with no waste, one being cut diagonally , as shown in diagram below. This represent the roof of one 180 ft2 hexagonal module.

This stronger 'vaulted' surface is made up of three planes, each one made up of of-the-shelf building materials. You need to love that since it also applies to walls and underside panels (in the case of stilt houses )