Adorable coop! I don't know about your weather, but we've got high humidity so it feels like it's 105 degrees & I've got tons of windows open yet they still prefer to stay out on the gazebo perches, it's just too darned hot.
They like to feel safe & secure from predators, as well as comfortable, so I'm not sure what kind of weather you've got right now. They don't care for rain & they don't like a coop that's sweltering hot.
I have too many roosters as well but I gave a friend 1 for his hens recently, and I have...