Firebox, it would be epic if you could make a full set and release them as a package
I'm thinking like
Tiger -> Rhino
Goblin -> Hunter
Raider -> Cargobob/Maverick/Seasparrow (undecided)
Baron -> Hydra (done)
Bandit -> Jester (done)
Cam -> Hmm, maybe Super GT, because of the loss of grip at high speeds?
And also, if you can vary Jester models to have spoilers or no spoilers, perhaps you could vary paintjobs too?
Just a little project you could work on