Cool metal barns
We had prefab structures for extra classrooms, while our high school was being remodeled. It felt a bit like being in a big huge RV. I hopped on the internet and easily found a few companies that offer steel buildings for both commercial and residential purposes. The Government Services Administration has approved a lot of steel buildings for government use, including use by all branches of the military. Steel buildings are used commercially for hangars, boat storage and warehouses.