Exterior, Flat RoofLine, Metal Siding Material, Metal Roof Material, House Building Type, Prefab Building Type, Wood Siding Material, and Glass Siding Material This custom residence for actor Will Arnett was inspired by LivingHomes' RK2 model. About a third was built on-site, including a glass staircase tower and a guest wing (featuring a recording booth where Will can ply his trademark baritone).  Best Photos from Here Are the Modern Prefab Designs That Amazon’s Investing In