Go to the next step for necessary pieces and tools.
Step 1: Materials
4 - 16 inch 2x4
4 - 13 inch 2x4
8 - 1/2 inch washers, or any size washers that suit you
2 - 3 inch PVC couplings
2 16 inch squares of plywood. I used 3/8 inch. Use what you want.
wood screws (for the base, I used 6 X 3/4 and for the frame itself I used 2 X 8)
maybe wood putty
paint (if you want)
I will say, that I have found my construction grade lumber to be disappointing. There were cracks that were hard to drill through or put a screw through, hence the wood putty being needed to hold the wood together. At one point, I just used my shorted wood screws I am using to attach the base, to keep the wood together. I also had a spot where the split resulted in the wood missing a chunk, so I had to rebuild it with wood putty. In addition, when I did that, I had a little bit left over, so i filled in all the screw holes. It is really simple to make too! You just need a drill, with drill bits and screw driver heads. And maybe a saw to cut the wood if you want, but I used a rotary tool to cut my plywood. The choice is yours