while eating lunch today, I had the thought to add cars as the base model and have the body kit presets be the upgraded models, For example lets use the Vs Commodore (dream car). the developers add the Vs commodore and the body kit presets would include the the Calias, SS (v8), Manta, ETC. Then the Devs could add cars for example the 1995 HSV GTS-R, CSV Strada and the SLR-5000 (VS) in the festival playlist (if the devs were to take this a step further we could have cars like the VL turbo and the VL aero)
by taking the vs commodore I mean adding the base model (standard v6) and the body presets to give the car the other body kits/ upgrades to make it the model you want