Tesla is working on their 3rd platform now for cybertruck and their $15k next gen vehicle. The key innovation relates back to the original GM skateboard. Steer by wire. No drive shaft, no steering column, all by wire. Put that on top of the structural battery pack skateboard design and you can now build the whole car in modules and then just connect them together at the end.
The Real Reason Tesla Developed Their Own Battery Platform!
Attribution: Art Hunter