I have had a VIN since May with build date of June 21. It has been rescheduled 6 times and is now Nov 2. The dealer did go in and make a change for me adding a locker rear ended. I have the Preview Order to prove it. So yes changes can be made.
You might want check with the dealer on that, mine also got pushed from 8/10 to 8/16. Since it’s rumored they will shutdown the week of 8/10 and 8/23, the dealer looked it up and now tells me it’s scheduled for 8/30 with nothing from Ford.
Received my email today with a build week of June 21.
Reservation made on 7/14 at 10:00 am, ordered 4 dr BB, Area 51, 2.7, auto, auxiliary switches, tow hitch, floor mats, MIC top and Mid package.