There is habitat work being done at the Fort Indiantown Gap military installation. Once the habitat has been improved the reintroduction of wild quail can talk place. I'm thinking at least a couple years on the habitat.
"The wildlife and it's habitat cannot speak for itself. So we must and we will." Teddy Roosevelt
If you guys want the best chance of success, I'd recommend building large blocks of native grasses, etc. Edge cover that is easy to hunt will be easy for the hawks and foxes to hunt as well. Shrubs are better than trees...as the shrubs provide cover and don't provide convenient perches for hawks. Small pines are OK, but once they get too big and thick the quail won't use them. Some of the areas I find them here in Maryland have 6 foot tall grasses but still have a nice open understory. I hope this works well for you guys...good luck!