Yesterday I converted my rabbit growout tractor into a temporary chicken coop. All I did really was add some places to roost.
Before finding this site I would have picked up a 2x2 on my trip to the hardware store and cut it to length and used that. Seeing some of the other projects here made me rethink and realize I had some perfectly good branches lying around in my firewood pile. This is both costs less money and is a better solution. So, thanks to the community for sharing and inspiring.