I use sand in my house and run and I am very happy with it but am considering making a 4 x 4 box in the covered run with bedding in it to a) sprinkle scratch into for entertainment and b) have a deep litter area to attract some fly predators. We had a pretty bad time last summer with flies and fly traps are REALLY stinky. My coop and run didn't smell at all but that fly trap made being out near the coop yucky. So I am wondering if I could make a wooden box with an open bottom that I could put into the run (which is roofed) and just use it as a mini deep litter /treat area or would it be too moist from outside humidity to try something like that outside of the coop? I've read a lot of posts on the deep litter method and it sounds like it would not be smelly. Is that right? My coop is very close to my neighbor's house. Thanks for any advice.