"just the motor" is a worthless paperweight without the electronics to go along with it. If I were trying to do what he is doing I would try to get the whole front clip of a donor car... cut the whole car in half aft of the dashboard. That should get you all the control modules and wiring you should need... unless chrysler is stupid and put important control modules in the back of the car.
The wiring will be no small undertaking. This is from when I retrofitted power memory seats to my Jetta (I had the whole body harness and had to sort out what I needed to move into my car):
Solder is
so 1970:
-Jason