If you are hoping for chicks, make sure the bottom 5 inches or so are either solid or have very small spaces between the wire, to keep chicks in. Also be aware you will most likely have to remove either the mother and chicks or all other quail - otherwise the others are likely to hurt the chicks. They might even stress the mother off the nest during incubation.
Seeing as you haven't started building yet, you might be able to anticipate the need for separation in your cage design - you could for instance place a wall part way through the middle of the enclosure, leaving a smaller opening that can easily be blocked with minimal disturbance to any broody hens. Or you could plant only the corners of the enclosure making it more likely that any broody birds will be laying in a corner, and pre-fabricate two wire walls ( perhaps with a wire roof as well, if your enclosure is high) and a feeding door to fit around the plants in any corner, so you can quickly and easily fence off a broody hen and her nest. Again, be aware there are no chick-sized gaps anywhere - they can and will find them.
