I will contact Ray-core when I finally have blueprints. R-26 in a 3.5-inch wall? Yes please!
I have read a couple of times that SIPs cost 10% more than normal stud walls, but 10% more for double the R-value?
All Darc, the bamboo roof is interesting, but I am unsure how to insulate that. The guy who built the shed said he did not like Dome Gaia's foammaker, so he made his own.
Hersbird, I will read about the pyramids, but everybody knows they were landing sites for alien spacecraft. I did not see anything by Singcore on eBay, but I did see this $10,000 tiny house:
https://www.ebay.com/itm/Grey-Tiny-H...gAAOSwfchcq7JJ
I am unsure how it qualifies as a house. It is so small that they do not list the dimensions, but it has Singcore walls!