Fabulous coop. Since you free range your flock give them a few scattered shelters for daytime snoozing or hiding from aerial predators. The trees will provide shade but also provide Hawks a vantage to watch your hens before swooping down on one. Have some doghouses, benches, plywood planks on cinderblocks, rose bushes or thorny evergreen shrubbery scattered around the open field so a hen doesn't have to run far to hide. A running hen in an open field is an invitation to a hawk. Our Cooper's Hawk visits once in a while but we have so much in the way of popup canopies, doghouses, low shelters, and shrubbery that he can be 5 feet away from a hiding hen but won't go after her - darnedest thing I ever saw. He seldom comes around any more. I think the neighborhood Crows have ganged up on him to keep him away. I didn't used to like Crows but they actually are quite useful here in the city - I wouldn't trust them to stay away from baby chicks however. I've seen them go after ducklings.