Youtuber @[100095217108574:2048:Nighthawkinlight Projects] has just posted a great DIY friendly tutorial for creating aircrete:
https://www.youtube.com/watch?v=z4_GxPHwqkA
Aircrete is of interest to seasteaders as a building material that is lightweight (can float in some formulations), low cost, and UV/rot/insect/corrosion resistant.
▶ Watch on YouTube