Is it possible to drive 6 dc motors from the m4 board to make a frame fly with a hex pattern of motors? Maybe mix the motors as a Y-3 pattern but have 3 pairs of 2 motors soldered to one plug if that makes any sense.. So you're driving 6 motors with 3 plugs. If each motor driver can handle 5 amps they should be find there as each motor probably only draws 2 amps max.
Thoughts?