I'm wondering if I should just build a Fort Knox coop and then a topless enclosure (all hardware cloth of course for the sides) that takes up the entire 3/4 of an acre that's unused.
I have a Fort Knox coop for the night. In the daytime, my chicken run is fenced in with 6 foot tall 2x4 wire with bird netting on top for Bald Eagles and hawks which I have where I live. My chicken run is not predator proof, but it is predator resistant.
Hardware cloth is expensive, and if you don't have the top enclosed, a predator could just climb over the hardware cloth fence. My daytime concern is from above, which is why I have bird netting on top of the chicken run. At night time, when I would have most of my predator concerns, my girls are locked up tight in their coop. So far, it has worked well for me.