There are several oddity models that aren't far from being overpowered WIGs, thus able to fly well out of ground effect at normal model weight. And example is the flying Porche which was featured in RCM many years back. (that's one reasonit has a delaye roll response at normal flight altitude)

The approach I'd take (if I were you) for your project would be for to learn to fly a conventional R/C aircraft, then build the prototype WIG model, and stay light until you trim it and verify correct CG at a good altitude. Then start adding payload.

I'd imagine the roll control would need to be done with a large differential to totally preclude adverse yaw.