While cutting out the P38 and B25 got to thinking about the drive system again.
Thinking about using a modified Moore Drive. Instead of running to a gear setup to utililize a longer rubber band length inside the fuselage. Why not mount the rubber band in the wing. The spar can be the anchor for the far end. As shown in the screen shot below, it has a 20" long length vs., 12" for the angled direct mount to fuselage as shown.
This screen shot is a quick draw to show method. Rubber band will probably pass thru the spar for clearance and decrease the angle needed of the Moore Drive.
Mike