Abstract: A reusable building foundation system assembled from a plurality of modular composite panels forming the outside and inside containment barriers for a form fill concrete foundation or wall. The panels are removably engageable by an interconnection frame along the vertical edge(2) of each panel having through holes(9) providing for fastening with threaded devices. The horizontal top-line(3) and bottom-line(4) of each inside panel interconnects with the opposing top-line(3) and bottom-line(4) of the outside panel via snap on metal connector bands(6,11) allowing for adjustment of the width and angle of the wall while increasing rigidity to the entire form system. Each panel is constructed and arranged having first a core of rigid, light, and durable medium such as balsa wood or rigid foam shaped into structural support ribs then covered in a coating of fiberglass and resin making for a light, durable and easily transportable system.