I mentioned access in my earlier post. I'd like to go further and say, don't do any "chook only" sized doors. Do a 'chook-sized' in a human-sized door, but make everything easily human accessible - ie without having to lean in, climb in, or walk right the way around to another spot to access...
Access of some kind that doesn't make you have to bend, crouch, twist, duck, etc etc. I saw a fellow on youtube cleaning his coop, and it opened on both sides. All he had to do was push the bedding out into a wheelbarrow parked alongside. If I was building a coop from scratch, I'd do that...