Just FYI, when I called Tesla about a week ago to check the status of my Model 3 order and when to expect the configuration email. They told me that it should happen in Dec or Jan at max as they were about done with sending the emails to Tesla owners in LA and about to start on non-owners. I asked if my CPO order helped and they said not really. So I think they are moving fast with the process and most people that placed reservations on 3/31 should start seeing invites. That is just a guess.