I need to create a Simulink model of Tesla Model S. How could I do that?
An entire Model S? I think you need to model it subsystem by subsystem. Pick one function, like the braking function, and see if you can get all the interactions up and running in Simulink. Don't be surprised if you have to wait overnight for some of the calculations to complete.
This is how modern automobile design works; you hope you can factor the behavior into independent tasks, because otherwise the simulation would become intractable. The last thing anyone wants is a car whose headlights turn on because you adjusted the driver's side rear-view mirror. For example.