welcome to the Forum Steve.
congrats on your van order. it's a long wait. below is my schedule from start to end in case that helps.
you'll still need another helping of patience before you get delivery on that van.
07/11/14 - van on order
09/02/14 - 2015 production started
10/02/14 - order selected for production at end of October.
10/17/14 - got VIN from the dealer
10/30/14 - van produced
01/10/15 - delivery at the dealer in CA
regarding the door opening height, I measured mine and got 43" at the sides, 45 at the max height but the middle area has a drop down bracket for the door locks that's about 10 inches wide so the clearance drops to about 43.75. Hope that helps.