Further to Milt's comments about control inputs:
Strangely, there aren't any wing control stops in the DC3 aileron circuit; the ranges of movement are governed by cable adjustment. I've no idea why it was designed this way - it could take considerable time to rig the system whilst keeping within the recommended cable tensions. The ailerons had to be set up with an inch of droop as well because they naturally rode up in flight and that gave a true neutral.
The elevators, though, had stops.