Welcome from St Charles Illinois! I am new to this forum, too.
I saw a great outdoor building in a shed design book from our library. The walls were made from circular log ends cemented/stucco'd together very much looking like coins face-up surrounded by milk, very olde English tudor look! The preferred wood was locust tree which grows along the east coast. The roof on that one was cedar shake, but I wanted to do it with thatch! Since the walls were very thick and solid, at least 6-8inches, it seemed perfect for chicken protection from predators, and would keep cool in the summer and warm in the winter. The windows were made with nice deep sills, like shelves, too.
One of our trees came down so I saved the logs. But the tree cutters didn't speak english and I was unable to communicate my desire for 8" segments. So now I have a wall of American Mulberry logs about 2 feet long each to deal with, and I hired a carpenter in the meantime to build a plain old shed out of plain old wood. We're still working on that to make it into a comfortable coop. I have plans to keep the chicken's indoor habitat up at my waist level so I don't have to bend much to keep them tidy and healthy. Have to protect my back!