My original tracking documentation showed a "vehicle fixed date" (V250) of May 13, 2022. But, when I asked my sales representative to make one additional change back in late-April, I was informed that this date had been moved up to April 26 (and the build had become "unchangeable"). This was confirmed via Track My Dream, which shows that the Change Freeze Point was reached 4/26. So, unless I missed something, my build "froze" 2 1/2 weeks early.