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To answer your question with my own question, why do you think that castles had draw bridges?
We built the same type and it is fort knox. We used commercial strength hardware cloth on all wire areas and over the window openings. Surrounded the foundation with same attached to foundation and extended out 2 feet--covered that with tampered dirt and very heavy >20 # stones lined around over that. Make sure there are no openings anywhere over a 1/2 inch. Use raccoon proof closures on all openings. And if you feel it is secure, then you don't have to lock in roosting area at nite. But I would put a chicken door in so you can keep them in or out of the roost area when needed. When they are young, lock them in at night. Also, you can lock them out in the run to clean the coop. But can leave it open most of the time.
My run is as secure as my coop.
I got tired of the battle with mother nature and her chicken loving critters...
As such, my run is open 24/7 to the birds, no door, just a hole.
While I am not inclined to, my birds can go out as early as they want, often ~5:30am ...