Yes a lot of people do droppings board under roosts. I just have too many hens and not enough time each day to clean them. We are doing deep litter method. Also use Sweet PDZ in the litter to keep the smell down. It really works.I have seen something like this but I think they mounted a wide board underneath to catch the droppings and make clean up easier. I guess if you attach a lip to each side of the wide board under the roosting bars you can cover the board with fine sand for ease in scooping the droppings. Hey that sounds like an idea... I'll have to brain storm that one.