Abstract: The invention provides pre-fabricated self-contained building panels, including a panel incorporating a truss structure as a part thereof, and combinations thereof. The panels include a skeletal assembly comprising generally an array of plural structural steel channels, rigid sheeting proximate to said channels, support members adjacent the rigid sheeting, the channels supported between suitable base plates, angles for defining portions of said skeletal assembly and a forming structure as a part of said skeletal assembly, said skeletal assembly and forming structure being oriented horizontally on a planar surface. A self-hardening material, such as concrete, clay, etc. is introduced to the forming structure for embedding at least a portion of said skeletal assembly. The forming structure becomes an integral part of the completed building panel and is not disassembled therefrom.