I use the dog carrier split in half too, they love it. I also cut a 30 gallon planter in half for two more. Easy to flip them up to collect eggs and pick up for cleaning.I just started setting up my first quail pen last night. So, not an expert on quail, but this is what I'm doing. Maybe someone can get ideas or offer insight if I've done something wrong.
I had extra dog kennel panels - not chain link - the heavy gauge, welded wire type. I was going to make it 10'x10' but realized the posts holding up the deck above would be in the way, so I made it 5'x10'. The area under the deck is protected on three sides by the concrete basement foundation (the house was built on a slope, so it could've been a daylight basement, but wasn't built with an exit). Next I wrapped the whole thing in 6' tall chicken wire. Then, even though it's mostly protected by the house, I put a tarp above for more extra protection from the rain and for shade in the summer. I'm going to add some branches for cover and perches. Probably some potted plants. I usually use those plastic dog houses that split in two for shelters for my waterfowl. I take them apart and each half makes a little shelter. Would quail like those, too?