Can you win it a second time by doing the same championship? I kind of tested damage on my veyron and have a 500 000 credit rigidity rebuild.
That rigidy rebuild is always an option whether damaged or not...or so is the case on my gt5? So don't go spending until you know for sure.
You can't win more than 1 Veyron from the GT World Championships, used ones cost 2,000,000 credits and have 0km on them.