I wanted power windows for my 66 dart but I"m cheap!
heck it's super easy .. get yourself a micro switch that is normally closed, that way it completes the wire circuit.
bend a small bracket and screw it to the inner door structure and attach the switch and wiring from the down wire setup. So that when you have the window in the down position it will open the wiring circuit by hitting the switch and opening the circuit.
Since the switch is only for the down wire (basically you just open the ground) you can hit the up button and it'll go up it the same wires going to the motor but different connections at the poles on the switch. that closes the down circuit again so that you can roll the window down again.
since the switch is double pole and double throw it'll work.
if the switch is single throw double pole it won't work.
The bad part is you have to run the wire all that way back to the switch and that 's a long stretch in the dart since the switches are going in a custom center console.
I'll see if I can find my mini switches that are normally closed and wire it up and test it . using video of course.
