if you are good at wiring/electrical, it can be done.
you're probably not gonna have the most stock set up ever, but it can be done. The coupe I got had aftermarket power windows wired in. he put the buttons between the seats were the arm rest is. he had to basically wire everything in. It takes alot of time and you have to pay attention to details, thats why alot of people say that it isn't worth it.
so no, it isn't quite as simple as putting fuses in, but yes it can be done.