The Ideal "Puna" House Design

[john the architect]

Youser,
I wish my students asked as many questions. But here you are:
-Forming concrete in the traditional way is expensive and difficult, the reason why ICF construction (the original Castleblock material) is so popular. It also makes concrete construction a DIY process, with a certain amount of set up, basic tools and guidance.
-Yes
-The most expensive I can afford. Depending on whether it is catchment or not, and covers living or sleeping spaces. Tin-aluminum coated corrugated metal is the cheapest decent material.
-Stainless steel (careful, there are grades of this and it takes the high grade) or composites/polycarbonates.