A building panel system is provided that includes a perimeter frame; a main beam attached to the perimeter frame; a carrier attached to the main beam, the carrier having a plurality of identical hook members, each of the hook members having a protruding hooking portion on only a first side of the hook member, and a non-hooking portion on a second side of the hook member, the second side being opposite the first side; and a plurality of panels removably attached to the carrier, each of the panels being attached to the carrier by engaging one of the hooking portions.