Try links in this post: https://www.beamng.com/threads/generic-shopping-cart.52762/#post-807754 Update: For Blender 3D tutorial, maybe this series might work:
It costs millions of dollars to start a design and get a prototype out. After that, it's up to you. Ask Elon Musk for help.
Link I gave (shopping cart) has list of links I made for other person that needed same information you are asking, checking those should give you information how to make a car.