Sounds like a great little project. Any chance you could share a couple of photos of the chicken coop? It would help other members provide much more specific advice if they could see what you are working with.
A very warm welcome to the Workshop community. We're looking forward to seeing how this project progresses and trust that you'll get loads of helpful advice and inspiration for all your projects around your own house and garden from our ever-helpful members.
Feel free to post whenever you need a hand or have something to share.