It looks to me like Tesla will hit their "3-6 week delivery" estimate for anyone who configured by Feb 17, essentially by end of Q1.
Using CJ/Troy spreadsheet (which changes by the second) as of this moment, there were 12,500 invites thru 2/17.
70% of invites configure, = 8,750 orders.
8,750 - 7,561 deliveries = 1190 orders to fulfill by 3/31 for the "3-6 week" estimate to hold up.
1190 orders / ~670 current weekly production rate = 1.8 weeks of production, leaving 2 weeks for transport/prep/delivery by 3/31.
Naturally the above won't occur for a variety of ~isolated reasons (perhaps a black batch is the last to be made, and someone in upper Maine ordered one and is out of the country the last week of March), and naturally some who configured post-2/17 will have their cars by 3/31 as well (more likely those living near Fremont, and/or ordering the large-batch popular colors such as blue and charcoal).
CJ/Troy sheet has been amazing thus far. And its current information predicts those who configured thru 2/17 will take delivery by 3/31.
Pretty cool.