ok the old fart will kick in...yes it was called THE THING it was marketed as a vehicle you got dis-assemble and reassemble however you wanted to personalize it, kind of a hippy thing. You used to see them driving around with no doors or other body parts on them. They didn't last too long.
lol, I remember my dad talking about those one day.
Also, isnt GM developing a new platform that is sorta like the thing? I believe I heard that it will let you greatly personalise the look of each car (swap in/out the quarter panels, body kits, etc) for a non outragious price.