Automation crashing is poop

Have you even looked at that? There's no tutorial for splitting a car in different parts

 

I know but he wants to make automation cars better so it could help him idk :/

 

I would separate the hood/fenders/ect in blender and slap it onto the closest vanilla jbeams, then just node edit everything into position so it crashes pretty and has the right weight balance.
There is an official beam modding discord that has videos and people to guide you, but this project will probably take you 80 hours to complete even if you pick up on things quickly.