More oriented to multi-unit, permanent builds: https://www.montainerhomes.com/ High-end, semi-stackable: http://kasita.com My favorite ultra-low-cost builder: http://relaxshacks.blogspot.com/ My favorite youtuber for sustainability broadly, with a focus on housing: https://www.youtube.com/user/kirstendirksen

One I came across recently is http://www.coodo.com

a very different aesthetic, but I like Matt Bua's buildings in upstate NY: http://bhomepark.blogspot.com