To maximize production, increase your ratios to 5:1 females to males. One male to five females have always produced an excellent fertility rate for me (right about 100%). They were younger males though, older might have issues. I wouldn't keep anything older than a year old though, butcher and stew at that age. It takes about 5 weeks for them to mature and start laying eggs. If I remember correctly, the minimum caging requirements were .5sq ft per bird. Small cages, you'd want more per bird, larger cages, you could easily fit more. Just watch the condition of the birds. If there's fighting and feather plucking, increase the space/butcher a few birds. Bald heads isn't uncommon in females (even with 5 females for every male, they can still be a little overzealous and pull feathers from the females' heads when breeding). My girls laid an egg every single day, with 1-2 missed days per month. Awesome production animals. Not much meat, but hey, their feed:meat conversion is MUCH better than chickens.
Edit: Misread your post... Guess you didn't say "breeding pairs" lol. And, as for caging, I kept mine indoors (EWWW on the dust/dander factor!), but outdoors, I'd stick with a wire bottomed cage. It just helps with disease prevention. They aren't walking all through their poop and aren't getting into the dirt to pick up disease from the dirt. Roofs help to prevent contamination from wild birds. Just make sure the wire gage on the bottom is somewhat big and the spacing small, but big enough for poop to pass (.25" is too small, try .5" for ADULTS only). Also provide a respite area with solid flooring so they can get off of the wire bottom. Any kind of washable, non-porous surface will work for adults. You could use wood, but make sure it's well sealed to prevent bacteria from soaking into the wood.