In the 4.27 open beta
Then you can just 3d fixture the body to do what you need to do
The wheel wells I meant.
three fixtures and an advanced setting slider later
Model_24_-_Trim_29.car (14.7 KB)
Take a look for yourself
Well, if you want it bad enough it is still possible, with enough amount of 3d work. I suggest you to look into some of @T0M s work and you will realize that Automation is a more powerful tool than it first seems like. Compared to that remodelling the rear wheel wells are a piece of cake.
Show us all the parts you used
I gave you the car file, put it here.