First off, welcome to the club, I have been hooked on wagons my whole life so I know where you are coming from.
Second, I beg you not to cut up an Oldsmobile Custom Cruiser and make a race car out of it, while it would be cool the car is too rare to do that to it, plus the vista roof would be a source of unwanted chassis flex. If you want a wagon race car, look for a Caprice with floor rust. The no option Caprices are lighter right off the bat too.
Once again, welcome to the club.
Ray.