Ok, update. It's probably best to just stick with 1 class (thinking Bullet since more people signed up for that). martin170 was insisting on having pits for the race, however Chaparral 24h doesn't have a pitlane. I'm thinking we can just make our own pitlane at somewhere along the back straight, however we won't have any wrenches. The Bullet is pretty resistant to damage though, so it shouldn't be too big of a deal.
Alternatively, we could switch to Sorcha for the race, which has a pitlane with wrenches.