I don't think you're going to get the full Service Center experience with the 3. I don't think you'll get the choice. The numbers just don't work in the alleged volumes. You won't be able to get it at the factory, either for the same reasons. EM is already sending you hints. Instruction videos means no one is going to put a bow on it, and hold your hand while you pair your smartphone.
Tesla Model 3: Elon Musk details the 5 minute delivery process, paperwork & instruction videos to be sent ahead of time
We're going to get the Amazon/UPS experience:
Reserve online.
Configure online.
Order online.
Pay online.
Accept online.
Download final paperwork online.
Report delivery issues online.
Your car will go to a regional staging center, where it will be cleaned up, and prepped "assembly line" style by minimum wage, temp workers. It will be cross docked, and a final mile car carrier will bring your car to your driveway, pre-charged, and drop it. No white glove service. If you have issues, you'll need to make an appt. at the closest SvC center. Damage will be between you and the carrier.
These cars will be delivered more like refrigerators, not cars.