Its just my opinion but large scale aircraft are very easy to learn 3D as well as precision flying with when they are kept as light as possible and there is no need to add allot of extra structure for 3D flight loads because believe it or not, 3D flying doesn't place a great deal of stress on the airframe, in fact some typical IMAC maneuvers produce much more stress. The heavier the airframe, the higher the flight loads, it is just that simple.

Bob