CinnaBun
Songster
There is another poster that built that this coop (I think they made it a bit bigger). You may want to read some of their posts.
https://www.backyardchickens.com/threads/where-to-put-roost-bar-and-windows.1404842/#post-23059618
https://www.backyardchickens.com/threads/where-to-put-roost-bar-and-windows.1404842/#post-23059618