I wish I had found this site sooner.. I have finished Run #2 (#1 too small and not predator proof)... now have design instructions for building coop #2 since 1 will be too small soon, and I am ready to put in sand box#2.. I don't seem to do anything chicken right the first time. I used a small litter box and well... I can see now when the girls are grown, one full size hen will not fit. I have an old 25gal wash bucket laying around the yard ( former un flippable dog bowl) that I was thinking might be large enough.. anyone have another idea or will the wash tub work?