I have been enjoying reading all your plans-makes my little chicken coop and run feel pretty cramped. It is not quite tall enough to stand up in, and has a slanted roof. If I were to do this again, I would figure out a way to keep from having so many little hiding places where braces, rafters and the like meet. They create lovely places for wasps to build nests. When I see one going in the coop I watch to see where it goes, and eventually I have to block the chickens out of the coop and spray the nest. Always an unnerving prospect. Imagine not being able to stand up straight, wearing bifocals, having a stiff neck and a can of poison, stuck in a small room with a nest of wasps. Spray up around where you really can't see, back out and run like heck.

I didn't have chickens for a couple of years, and when I was preparing for new chicks again this spring, I found three HUGE wasp nests tucked away in the corners. One was in a nest box. These things were nearly 5" across. Of course, they were old abandoned nests by now, but, still!
Anyway, that's my advice. Don't make it too welcoming for wasps.