The lengths of wood you will need are:

12 3 ft long pieces

4 2ft 2inch pieces

4 1ft 2inch pieces

Cut the wood. Then move on to assembling.

You may notice that on the base pieces I put some blocks on. Those are intended to(hopefully) increase the stability. I used a drill to drill holes so I could then screw screws in. Attach the base pieces at 90 degrees to each other. Then measure an Inch from one of the 2ft 2inch supports. That point will help you to make sure that 1 inch is below the top of the wood. Screw all the supports on. Mark an inch from the top and screw one of the three foot planks onto it. Screw another 3ft plank on the same way and at 90 degrees to the other plank. Keep putting more planks on until there is a square . Then put on the 1ft 2inch supports the same way as the 2ft 2in supports. Attach the remaining 3ft pieces of wood onto the supports the same way as onto the 2ft 2inch supports. The assembly Is done! Sand It down If you want.