Once the plywood box is completed, we'll turn our attention to trimming the plywood box. For this step, we'll need the following:
4 @ 1x4x8' pieces ripped in half, approximately 1-3/4" wide
2 @ 1x4x8' pieces ripped to 2-1/4" wide
2 @ 1x4x8' pieces (no ripping necessary for these pieces)
2 @ 2x2x8' pieces for the support structure under the box
Begin by cutting two pieces of 2x2 to 48" and another two pieces of 2x2 cut to 21". Attach these four pieces together to form a 24" x 48" frame using 2-1/2" wood screws. Then, attach the frame to the bottom of the plywood box using a few more wood screws, driving the screws through the bottom of the box and into the edge pieces, taking care to make sure that the screw threads are not exposed.