this is a sketchup model that we worked from in building our first Structural Insulated Panel (SIP) hexayurt. we needed something on the base to level the floor, as the floor was also SIP based (because of winter snow). for this version we used full, square edged SIPs, with triangular foam to fill the gaps. We DON’T RECOMMEND THAT. Bevel your SIP corners instead. less (fragile) junk to keep track of.
to see how the situation turned out, check out one of the other hexayurt posts. the one we built had 4′ walls rather than 6′ pictured here. also not shown in this model is the inside frame, which may be excessive, but we felt that better safe than sorry principal.