Yes, but these two things are connected. Cheap, fixed, weathertight buildings are a solved problem. But as soon as you fix a building to the ground, you enshrine a rent seeking opportunity, and that space will then be subject to market rates, which will make the resource unevenly distributed.
If we had cheap, mobile, weathertight buildings (and another of other mobile amenities around them) then you could decouple the living space from the market locked to the location, and you could get something closer to even distribution.
