Very nice! I agree, you have some lucky chickens! I'm starting to think that a chicken coop is never quite "done"! I keep thinking I'm done and then I think of something else that will improve it. My coop is at
http://www.littlewolf.org/preserve/the-scoop-on-building-a-coop/ in the interest of sharing. I also free range, (no run, no fence at all) so I don't have that to build. However, I recently had to dig a few drainage ditches to divert water during 5 year type flooding rains away from the coop. Then, I decided I could stand to have an awning over the coop door and I have some old roofing I can repurpose for that. It's fun, like you are doing, to reuse materials you have, not to mention so much cheaper. Always something new to do!
Looking good, you have much to be proud of!
Guppy