How do you approach a build?

I build it in my head before I jump on the car.. I don't like having to much stuff torn apart at one time, for one I don't have a garage and two, my memory sux.... I collect engine parts as I find them, I focus on the body and rollin' chassis, if god forbid and I got hard up and had to sell it, I would be in better shape having a roller to sale then trying to get 2 or 3K out of an engine on a stand...