Abstract: A panel assembly for use in a concrete panel forming system having a pair of elongated, spaced apart and parallel side rails where each rail has a top and a bottom end. A top rail and a bottom rail each have spaced apart ends. The top rail is arranged so that the top rail ends are adjacent the top ends of the side rails and, similarly, the bottom rail ends are adjacent the bottom ends of the side rails. The corner pieces, L-shaped brackets and rails are then attached together by rivets. A sheet overlies and is secured to one side of the rails. Additionally, a plurality of cross supports extend between the side rails to support the sheet. An end portion of each rail is sandwiched in between an L-shaped inner corner piece and an outer L-shaped bracket.