Since I got most vehicles back working on my 1.11.2 flansmod fork, and the kickout/no-chunk-load bugs seem fixed I thought to start adding new features to it.
An idea I had is adding "Upgrades/Tuning", so that you can install upgrades like a better engine, spoiler, whatever and it would be displayed visually.
(Items, like the ones for creating vehicles would be used).
The question is though, how would people prefer to model it?
Part of the vehicle model - like doors.
Seperate Model - you can then reuse it on other vehicles aswel. (configurable)
EDIT: Please keep in mind that in current toolbox version you can't add new part types as it seems, thus there is a limit how many upgrades a model could hold, this wouldn't be the case if using seperate models.
This whole feature is yet theoretical and I don't guarantee I'll implement it, just askinig on opinions how it should be made ¯\_(ツ)_/¯