This is a bit crazy idea, but it was done in the past with the FD, FV, Formula Libre cars back on the days of GPL. As it looks like there wont be a car for each brand as it was in real life, I sugest the idea to have two chassises and three or four engines, that the user could choose from to build the car. The current DFV, the V12 and maybe a different V8 or V12 with different power curve and torque to create more variety. I don't know how physics work on AMS2 engine, but the point should be that the engines should transfer their weight to the chassis to create the final car. Other option could be that the wheel base change if there is a V12 or V8 engine installed, that could solve the correlation with the graphics. This way the car variety could increse and users could find their best car to drive, even in a championship cars could be asigned in some way to balance de grid, etc etc. I think the most difficult part of all this, is to change the UI to allow this customization, the other option is to have the pre build chassis-engine combinations.