It wouldn't take too much. You want a diagram of the contacts, which are not complicated - those are what tells the module where the motor is. Figure out which contacts are the low-high contacts, and use a double pole, double throw switch (so it can have two circuits) and each circuit will use a relay. The control side of the relay will be wired to the switch and the contacts for low-high, and the load side of the relay will power the motor. You'll need one circuit to use one set of contacts to spin the motor one way, and the other circuit will spin the motor the other way. I've never done this, but I've torn the motors apart before, and am a heating technician that's taken a ton of electrical controls classes in college - I know I could do it, and that's how I would do it, and that's basically how the module does it.