I highly recommend "poop boards" with a 2x4 as a roost placed a few inches above the board. I make my poop boards 2 ft wide and the length of the roosts. Underneath is the perfect place for nest boxes, feeders, waterers, pop door for the outside, etc. - leaving the rest of the area largely open space. If you search on this site for "poop boards", you will find a lot of info. Mine are pretty simple, I put feed bags in top to catch the poop and just fold them up and carry them out to dump every month or so. Some people use sand or some kind of litter and scoop every day. I know I wouldn't follow through with the daily scooping, so I let the dropping accumulate there. Probably more work in the long run, but it works for me.
There is a thread somewhere about "inventions" people have made and it has a lot of neat ideas, if you haven't read that, you should.