I have a friend that does it with the jumbo japanese quail. All in small cages. 3 or 4 females, and one male per cage. Rig artifical lights, and they will lay year round.
His process is basically hatch 50, eat most of the males at age 8 weeks or so. Around 8 weeks, the males are sexually mature and start creating problems.
Then, at around 12 weeks, save the big/healthy females for breeders, and eat the rest. All the birds are basically at full adult size by week 12. So, after 12 weeks or so, if they are not laying eggs/breeding, you are throwing away feed.
Meanwhile, he is getting 5+ eggs a week per female. So, tons and tons of eggs.
He has one incubator, and hatches a bunch in March from eggs he buys. Then, in Summer, he does two or three more batches of his own eggs. So, by October/Nov, he has a whole bunch of birds for the freezer. Then, he shuts down, and starts again the next year.
Says its not cheaper than store bought chicken, but they are tasty little birds, and he knows their history/food sources. His main problem, getting rid of all the eggs.