by indraastra, published
A relatively sturdy 24"x12" plywood+MDF tray.
In the pictures of the prototype, the sides are made from plywood and the base from a thin sheet of MDF, but an acrylic base would look better for the final design.
The design can be cut out twice to make both sides (they are symmetric), and the base is just a simple 24"x12" rectangle. The sides form a slightly larger area to accomodate the base in the groove cut into each piece.