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The aviary sounds like a great size and you shouldn't have any problems!!
Regarding Diamond Doves & finches (doesn't apply to the larger and hardier Ringneck Doves), you will need ensure that the mesh is no bigger than 1/2" or they will escape. I used hard-ware cloth on my finch aviaries. Also prevents snakes large enough to eat them from entering as well. SE Ohio is probably pretty close to western MO in climate and I place the finches in smaller pens inside the barn with heat lamps. Finch species include cordons, waxbills, weavers, and just got a pair of zebras for foster parents. Last year, I didn't pull them out of the big aviary until Thanksgiving, but every year is different!! I do have a heat lamp in their outdoor aviary and lots of buses and tufts of grasses for them "burrow-in" and keep warm. Don't trust it though when the temps stay in the 30s during the day though.
Dan