So frickin' true. In Africa there's a company .aming building brick out of recycled plastic.
There are still cob homes standing that are centuries old.
You could take a downed tree, or pruning scraps use the wood to make triangular frames for glass or window quality plastic and build a decent quality geodesic dome home relatively quickly.
There ahould he more workshops on how to build your own home than there are on how to exploit people who need one. Fuck's sake.