Prefabricated building panels not of metal, namely, wall panels, roof panels, and floor panels; preassembled rooms not of metal, namely, preassembled frameworks for building bathrooms and mechanical rooms; structural wood building components, namely, building timber, construction timber, structural timber, manufactured timber, and glue-laminated wood; millwork not of metal, namely, doors, stairs, trim for windows and doors, baseboard, decorative molding, and ceiling panels