A lot of homes in the town I grew up in were adobe. The old fashioned kind with mud, straw, broken glass, etc. They were mostly plastered inside and out. Between one and two feet thick, they could stop most bullets and on rare occasions, did.
A house built in a week???
“Walls go up in minutes and a small house can be erected in one day using local labor and coated by plastering or stucco applicators ready for occupancy in about a week.
GigaHouse is a super insulated steel framed building system utilizing GigaPanel components and so energy efficient that it can exceed even ICF construction in thermal qualities.”
http://gigacrete.com/gigahouse/