I am eagerly looking forward to getting more chickens in the spring. My last flock were tragically taken out by a predator. I have a new horse barn where I specifically left space for a chicken coop. We were very tight on space so what I have indoors for the chickens is 4.5x9ft. It has a concrete floor and plywood sides. On one end of the 9' sides is a people entrance door, on the opposite short end is the dog door for the chickens to go outside. This is at ground level. It has 10' ceilings. What I'm wondering is if I should build multiple floors on the inside? Ladders going up to roosting space? Could I put nest boxes below a board below a roost? I want to be creative for the birds. As their whole run will be covered, I imagine even in cold weather they will spend quite a bit of time outside but I want their inside time to be comfortable. I want to get 6-10 birds. Thanks!