As we have seen from our Cuban and Eastern European cousins . . . pretty much anyone with a metal turning tools can keep the old technology cars on the road on the cheap. Since the introduction of the "canbus" backbones in Mercedes sedans back in the 90's . . . in addition to mechanical engineering, you'll need an EE to get all the old eproms and sensor circuits in shape to hit two decades. Think about what computer you might have been using in the early 80's . . . Apple II, TRS-80, Sinclair . . .