I think that 1 servo for even an aeleron pozes a severe ballence issue when it comes time to roll the plane, I can see how the plane (when rolling on the side with the servo) would lean much more than the side with out the servo. That could prove prety bad especially when it comes time to land... I could see how if you were going to use them only for rolling how RCKen had a good money saving idea. Other than that, I think the other designs are the way to go. Mini T