Factory built housing has been an architectural objective since we began building shelters. With the exception of mobile homes, it hasn't become a reality yet, & mobile homes don't try for architecture anyway. This may be changing, CA. has in place Factory Built Housing regulations for CA Building Code approved and factory inspected custom designs. Irontown Homes in Utah is shipping custom designs to CA. BluHomes in Vallejo has built and installed the Sunset Idea Home of 2012 in Healdsburg. There's light looking through the tunnel.