Very cool build! What sort of lighting will you have?
Sternotherus odoratus is probably the closest you'll get to a turtle meeting your requirements. They're not super destructive, but would probably leave some claw marks in your decor. I'd skip the turtle.
Some of the temperate zone treefrogs like Hyla cinerea, H. versicolor/chrysoscelis, or H. arborea would be a better fit for the tank than dart frogs. They are hardy, not prone to drowning, eat larger prey, and don't require daily feeding.
Speaking of things from the temperate zone, you could always skip the heater and do a temperate tank. Lots of beautiful shiners, killies, sunfish, and darters available to you in NC.