We just built a small coop for 3 or 4 chickens. It's about 4x4x4(at lowest, 5 feet high at highest). This does not include nesting boxes. My question is, we put in two roosting bars but would like to add a poop board under the highest one - maybe even take the other one out. Roost is about 3 feet high with 2 feet of head room. How wide should the poop board be and could it hinder the chickens from getting up to it? Perhaps a very LOW poop board just above the shavings?