Suggested

Chassis supplier

I hope developers consider my idea. Managers can choose different chassis suppliers, this would mean a different 3d model depending on the chassis and different bonus and malus (weight, top speed, tyre degradation, slow and fast corner speed).

I like your thinking. But does the car image really need to be different?

Should just allow more options to make the car our own.

Nose height and width 
Air duct shape round, square or oval
chassis length long, normal or short.

I have been asking for aero concepts and chassis upgrades for a long time. The aero concepts would mean different styles of design would be adopted with different strengths and weaknesses