I hope so, too. Sounds like you are on the right path. There are so many coops on here with construction photos, including my own original 8x8 coop (called the Clutch Hutch), that you can get lots of ideas on predator proofing. Nothing has ever gotten into our coops, no predator losses. The pens are not covered except for the bantam coop, but I have lots of tree cover and roosters who are always watching the skies. No matter what, they are all locked up safe and sound before dusk every evening.Yes it's a pen. It's a combination of hogwire and wood and we lock the door at night with multiple carabiners. I'm afraid the hogwire isn't good enough and something is getting through. We just have no idea where the predator is getting in, and it's frustrating. I've checked everywhere and I can't find a point of entry. if It's a rat or a weasle we're in trouble because they'll fit through small holes.
We've been wanting to build a real "coop" for awhile, and tomorrow we're going to the lumberyard and we'll build them a real chicken house with four solid wood walls and an impenetrable roof. Our friend just tore down a building on his business property and we took a solid wood door from him. I just wish we had done this before the chickens died. My fault completely.
Anyway, I hope they can get through one more night. We're building them a more solid place tomorrow.