I would like to put the roost up as high as possible since there will be the poop board underneath and I want to put food and/or water under it (the more room there is the easier it will be to put them under there). The wall will be just over 5' and we'll have a 6" wide vent up near the top. How far below the vent should it be? If it's a certain height do I need to supply a ramp? And how far below the roost should the poop board be?