In the very initial stages of working on a pallet coop. Want to use as much recycle as I can. I ended up putting a 48"x48" pallet and a 48"x40" pallet together to make basically a 4'x7'4" coop. Coop itself is going to have a 3' high wall at the back and a 4' high wall at the front. I am going to have 6 hens (they arrive halloween!)....so I think they have PLENTY of room (they will be outside in a 8'x7' run during the day). Biggest question I want to try and get answered.....I would like to allow the hens some room outside under the coop, and maybe put their dustbath under it or even the feeder/waterer. How much "headroom" will a grown hen need to safely be under a coop? 12", 18", 2' or what? 4' of the run will be covered, so if it has to be raised too high, then I won't be using the under coop area. I am in an area that allows chickens in the city, but covenants for the neighborhood don't allow (I have the blessing of all of my neighbors already), So I am wanting to keep the entire thing below fence line. So what say you chicken experts?