Wayne, if I may butt in here. If you look at the pictures closly you will notice that all the corners where the plywood meets (both vertical and horizontal) have 2x2 bracing. I used the 2x2's to screw and glue the plywood to. I also threw in a couple in back to give the front back braces something to affix to so I could put the back in place when all finished. I actually calculate the total 2x2 + 1x2 volume to be almost 500 cubic inches so it does add up in my box. I still don't know that it will make a significant difference but I would try to account for it if I were you Eric, just don't get carried away like I did.