What is the difference between what you’re looking for and just having a coop that you leave open so the birds can do their thing all day long then have a place to sleep at night out of the weather?
I have birds the were born in the woods on the ground yet as they got older chose to sleep in a coop or pen at night.
I don’t care what anyone says either if you aren’t killing a ton of raccoons, possums, foxes etc. you’ll lose every single bird. I’m not talking 5-6 raccoons I’m talking like 30-40 a year, same goes for possums. Foxes much less but it doesn’t take more than one to decimate your flock.
Many people you might get advice from won’t tell you just how many birds they actually lose.