RE: Upside-down Plane
I saw one once. It was a profile that was a P-51 on 1 side and an Me-109 on the other. The vertical tails were smaller than usual for RC, probably more true scale. It might have been made from the Tower Fun-51 profile. It looked pretty good and flew well.
It had a tail dragger gear on both sides and tail wheels on the rudders. .46 power.