Excellent idea from a safety standpoint. If you're going to harvest these seats from a car that you have in mind, get the seat tracks when you get the seats. It will be easier if the tracks are bolted in, you can simply unbolt them and take them with the seats. If the tracks are welded to the floor, it's a little more difficult, but can still be done. If you have power to the car, use a Sawzall after drilling some starting holes to begin the saw cuts with.

Place the seats in the Stude with the tracks in place hung on the bottoms of the seats and mock them up with pieces of wood or whatever you have to use. You can make spacers if you need them from pieces of pipe or stacked washers in order to mate the floor with the tracks.

Keep all the motors, wiring and such because later you may decide to convert the Stude to 12v. and the seats would work like they were intended to when manufactured.