The wiring harness for the window and locks is seperate and there is nothing pre-installed that you can just plug into.
I added the wiring harness for the power locks, windows and mirrors to my plain base coupe that only had the rear defroster for an option.
If you can find a donor car with the options you need you'll have to pull the harness in each door along with the rubber boot that goes between the doors and the frame and the power options you want like the lock motors and window motors.
The cross car wiring harness is the hardest to pull as it runs under the dash and down the center console in a "T" shape.
On the right side in front of the door there is a relay tied into the harness for the windows and also a ground point and the power is plugged into a junction block up under the dash near the left speaker.
Easy way would be to remove the dash to get to the wiring and take notes or pics as you go to help reassembly.
Hope that helps a little.
Steve
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Where will the road take you today?
Some helpful links I've done
How to remove inner door panels, with pics.
How to remove outer door panels, with pics.
How to make rear coil-overs using factory struts, with pics.
How to remove rear bearing hubs, with pics.
How to modify the stock Fiero radio for MP3 players, with pics.