I spent 6 months helping to prototype and build the Seed Eco Home at Open Source Ecology ('a modular incremental 1000sqft home that two people can build in a week for $50,000') to help solve housing. https://wiki.opensourceecology.org/wiki/Seed_Eco-Home
Unfortunately, the apprenticeship program was underfunded due to the lack of participation caused by COVID, and maybe more broadly, despite what people say, they are not actually interested in collaborating to reduce human suffering/advance humanity by solving problems like housing when there are personal sacrifices/opportunity costs involved. Look at something like https://en.wikipedia.org/wiki/Depopulation_of_the_Great_Plai... and it's pretty clear that the problem with housing is mainly social inequality rather than any underlying technical bottleneck...
