For quail housing, I made the "mistake" of buying a set of three battery cages, thinking they'd be good for short-term housing. (seemed reasonable, here the link:
3 quail cages) They were way too short, even for the quail they're designed for. I've since turned two of them into functional housing with good quail real estate.
I removed the original top, flipped the bottom to the top, then cut a ceiling access hatch strong enough to support forty or so pounds. The mixing tub secured to the open bottom creates a deep sawdust/leaf pool for the birds. With the access hatch, I can reach in to get eggs or clean. This one is attached to the coop with the slide-in dividers so if I need to do a deep clean I can confine them to the roofed side. The walking planks are waterproof vinyl flooring, which I find easier to work with and durable.
Most importantly, the birds like it.
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