Here's another guy who built a "Carolina Coop" knock-off, and did a nice job. I'm taking some ideas from him.
https://www.youtube.com/playlist?list=PL2n57wx_nRGaWNdjIXXHFWWkOJycEcpId
I used these videos a lot when I built mine, even Carolina Coops mention him in some of their videos around that time.