And that is what people have to keep in mind. Why we are discussing this. Its depends on what they are wanting to set up and what they want birds for. There is nothing wrong with those cage sizes even at home for Pharoah size or Jumbo Coturnix. But the number of birds in them for home use? Well, that I would change, just plan on not putting so many in them and plan on making more of them. If people plan for at least 1'square foot per bird of either size, their birds will be good to go.
Kind of like my Brooder, its 2' x4' but with 57 chicks in it, I had to get them out faster than I had originally planned. I felt they were to crowded. So my original grow out pen, led to adding breeder cages (that can also be used to grow them out in), and an outside brooder box and lets not forget the inside brooder boxes. Oh almost forgot the colony pens that are being buillt now to house 100-120 breeders to keep my line. I don't sell eggs so my chickens are going to love the ones I'm not using. Actually, I have to keep chickens just to have them to help me manage the quail.
Quail math for cages. Once you start, it just keeps going. So best to plan on it right at the start. Unless you want to buy eggs each time and hatch them out, grow them out and process the birds. THere is nothing wrong with that and is actually a good place to start if you have never had quail. (But it doesn't work with egg layers, because you have to keep them for the eggs). That's what I wanted to do, brooder tubs and a grow out pen, would have been so nice and simple, but see above....
OH, you do realize that just 4 years ago. It was a strickt NO NO to brood any kind of chicks in the house. But everyone does it anyway. So the Dr's are waiting on Respiratory failure cases in the near future. Got a couple of those DR's in the family, just shaking their heads especially at me.