I own a bare bones 66 six cylinder Mustang convertible with a manual top. I also have the two power top motors and the dash wiring (power top switch etc.) from a doner car with a power top. How big a job would it be to convert the manual top to a power top?
Easily done in an afternoon. Run the wires, install the switch, install the pump and hoses, and swap out the spring tubes for hydraulic cylinders. Then you'll have to run it up and down for a while to get the air out of the hoses and cylinders.
You'll also need to take the hold down clamps off, and leave them off.