I improvised on this a bit. I envisioned being able to put small items on the shelves at some point so I made it with solid shelves instead of all 2x4's. Except the stuff I bought for the shelves was so flimsy I had to add the support pieces. Ahh, well. I'm learning. And with the three support pieces (2x4's cut to size) running widthwise, it turned out to be a solid shelf. LOVE this site!! Thank you again, Ana! Next project is a bathroom vanity.