Exterior, Prefab Building Type, and Metal Siding Material Despite the remoteness of the lot and the challenges it posed, the light-gauge steel frame was erected in days, and the entire home was completed in two months—a testament to the ease and efficiency of the prefabricated system. The building sits on upright columns that are bolted to independent concrete footings, giving the home the illusion of floating.  Photo 2 of 8 in Offered at $674K, This Hybrid Prefab Is in Tune With the Californian Desert