Hi Chicken head34
I found a couple of sites that might help. I'm sure there are others as well.
https://www.backyardchickens.com/web/viewblog.php?id=10091-cochin-duplex
https://www.backyardchickens.com/web/viewblog.php?id=23574-my-pallet-chicken-coop
Good luck with your project!