I Know Tesla is adamantly against this, and there are so many complications with tax credit issues, etc....
But people are already doing it anyway. Here is an excerpt from a current local ad where I live. He is a current Model S owner:
"Get a Tesla Model 3 before anyone else.
If you place a reservation today you will wait over a year and a half. I am scheduled to have one of the first deliveries in (Name of State).
With current situation I am planning on keeping my Model S and selling my Model 3. I was going to order the car and sell it when it got here. I figured someone would want to customize the car and pick out a certain color and options. I am willing to sell my reservation for $7000 and you get to keep my $1000 deposit. So it is $6,000.
I don't know if Tesla is going to make me purchase the car in my name and then I can turn around and sell it to you or if they will let me purchase it or register it in your name. I know they will let me put it in a business name so I don't think they would have a problem with putting it in someone else name. You will be responsible for all sales tax and registration fees.
I am willing to meet in person, you can come to my office and we can pick out options you want. I would want $3,000 to place the order with your specific requests and then the other $3,000 when the car gets here. I should be getting an email in the next few weeks to configure the car and the sooner I do that the better.
Please call or text with any questions. "