Here is a thread you might want to look at, about 3 sided coops that people in warm climates use. Years ago, people in colder climates used similar structures.
If you can predator proof your pen with hardware cloth, you may have a fine setup, depending on your climate.
https://www.backyardchickens.com/forum/viewtopic.php?id=163417
If you can predator proof your pen with hardware cloth, you may have a fine setup, depending on your climate.
https://www.backyardchickens.com/forum/viewtopic.php?id=163417