Suppose you've got a door_hood, and a part that modifies parent_door_hood. This works, and that's all good!
However if you wanna modify something like wingArea, dragCoefficient, etc. then using parent_dragCoefficient doesn't work, meaning you've gotta modify the vehicle JSON with its own dC VM that reads a value on the part to make it happen anyways. That's no fun!

I'mma contribute as many of my don credits as needed for this.

This will be done with the CV beta.