Step 2: Cut the wood
Step 3: Put it Together
Glue the sides onto the planks of wood, making sure your Lego rectangle fits. Plane and sand the edges. Clamp the two trays and the extra plank of wood together and drill a hole through all the layers. Insert the bolt into the hole and secure it with a nut. Use a locking nut, or tighten two regular nuts together. Adhere the base plate to the top (I used hot glue). I had to cut a corner off mine to account for the bolt. Fill it with Legos.