My family has just picked up 7 red chicks to start supplementing our eggs. We are looking at how to do a coop. I can easily convert 1 section of an existing shed into a great coop with plenty of room if I can do a multi-level coop. How tall should each section be? How wide does the plank they will walk up and down need to be? We are new to this, so any help would be great! Thanks!