Once the five parts of the box are cut and sanded, we'll assemble the box. For this step of these free woodworking plans, we'll use biscuit joinery with glue and finish nails to give the box strength.
To begin, lay out the five parts of the box on a large woodworking table. Make marks corresponding marks about every six inches on each piece where the edge adjoins the next piece. Keep in mind that some of the biscuit slots will be cut into the edge of the plywood, while others will be on the face.
On the two ends of the box, the biscuit slots will be in the edges of the plywood (bottom and two sides). On the bottom piece of plywood, the biscuit slots will be cut in to the edges of the plywood on the sides, but into the face of the plywood on the ends. Finally, on the two side pieces of plywood, the biscuit slots will all be cut in the face (on the bottom edge and two ends).
Using your biscuit joiner, cut slots in the appropriate locations marked above. Cut slots for either #10 or #20 biscuits.