Taking this morning's numbers into account, I now guesstimate:
Entering 2018: 162,000 delvieres in the US
Q1: 8,180 Model 3 (all have been in the US so far, correct? Canada starting this Q), plus 50% of 11,730 S, 10,070 X: 21,800 / 2 = 10,900 + 8,180 = 19,080 US deliveries in Q1.
Total: 162,000 + 19,080 = 181,080.
That leaves < 19k for Q2 in the US if Tesla wants to shift the trigger to Q3.
I also updated
my Model 3 ramp estimate to take into account the guided 2k this week and ramp to 5k/week in 'about 3 months,' taking a conservative view that they'll hit 5k the first week of August (4 months from now) and that the ramp from 2k to 5k will be tilted toward the second half of the quarter. That leads to about 35k Model 3s produced in Q2 at an ending rate of 3,800/week. There are 2k in transit now and will likely be around 5k in transit then, so a net of 3k more in transit at that point. So around 32k deliveries of Model 3 this quarter. Tesla also guided that Models S and X are on track to hit around 100k deliveries this year. They're a bit shy of 22k after Q1, leaving 78k for the final 3 quarters. That's about 26k each quarter.
Normally about half would go to the US (~13k in Q2). Let's also assume Tesla is able to shift 50% of Q2 Model 3 production to Canada. That'd leave 16k Model 3s in the US in Q2.
181k + 13k + 16k = 210k US deliveries at the end of Q2. That's using what I would expect to be reasonable estimates for US/non-US split. The take-away for me is that Tesla would have to shift approximately another 10k away from the US this quarter in order to stave off the 200,000th delivery for another quarter. That's certainly doable, but would require some significant delivery bandwidth for Canada.