My cages are all 2 feet high. For bobwhites that jump a lot I use trampoline netting or screen strung across the roof so they won't get hurt. If your coturnix do this a lot that might help.
You have to clean the wood, and 1/2x1 coons can stick a paw through. They can still get the ones on the wire. Even with half inch they can. I put welded wire around the legs.
I use 1/2 inch wire on all my pens, raccoons can grab your bird's legs and pull down on them. I suggest 1/2 inch wire. I learn't the hard way with 1/2 by 1 inch...