Thinking about adding power locks. Opinions?

I have a 91 Voyager 3.0. It did not come with power locks and I have been thinking about adding some. I know I need the actuator to do this but what I am wondering is this. Would the wiring for the locks already be in the door just waiting for me..lol. Doubt its going to be that easy, but I have seen many model vehicles where the wiring and the such was already there for windows and locks to be added. Also, if they are not there has anyone done this before and ran there own wiring? Difficult job? I just like having little projects to work on now and then and seemed like a good one, who knows, I may even move onto RKE if the locks work out ok. BTW I am planning to just strip the needed parts from another van WITH power locks. Suggestions and opionions please.

Cmon, someone must have tried it or at least thought of it..lol