After realizing that we had too few nest boxes I asked my husband to build a few more, and I got "the look". We had no more scrap lumber or plywood. My girls REFUSED (brats!) to use 5-gallon pails- and milk crates didn't offer enough privacy. I was a bit bummed, because I wanted to reuse or recycle materials we already had. Oh, well. My other nest boxes are made for my leghorns and dominiques, and my partridge rock girls wouldn't use them. I tried the pressboard cubby-type shelves in closet rennovation sections of several stores, but the dimensions seemed a bit small. They were 10 or 11 inch square- smaller than the other nest boxes!. So... I looked for an enclosed milk crate, and found these. They have little pins so they can snap together. I hooked three, laid them sideways, slid them under the existing nest boxes, and voila! http://www.target.com/p/itso-Cube-White/-/A-12719910 And instead of trying to rig a board in front to keep shavings in, I just bought a few 10 or 12 qt dishpans at the dollar store. What I love about these is that I can hose them down and bleach them if needed, and I didn't have to ask hubby to build a thing. I put them in yesterday, and my bigger girls have already been playing around in them.