I downloaded this 3d scan and re-did the topology:
https://skfb.ly/FuIp
Textures were never really finished, but I think it looks pretty good. Thanks @alban for the cool car scans! I'm eyeing another one to do next.
Fun facts about the Opel:
-It was one of the early inspirations for Corvette styling.
-Yes, the headlights opened like that. Opel owners joked about having one really buff arm from operating the mechanical lever for turning on the lights.
-It was produced for six years, then went on a 34-year hiatus. Another car was produced in 2007, based on a Saturn Sky. Not quite as cool.