I looked at a reduced scale BT-13 and CG management was a problem. The front seat is over the cg so it doesn't matter if someone is in it or not. When flying solo you have to fly the aircraft from the back seat just like a Cub. Makes for rather poor landing and taxing visability. One could fix this problem with a removable weight in the tail allowing it to be flown solo from the front seat with the weight in place and with a rear seat passenger with the weight moved to the firewall. I have to run some numbers to see just how big a weight would be needed.