I documented my PCD trip from this past February here:
https://g80.bimmerpost.com/forums/sh....php?t=1993744
If you're planning to do a road trip anyway, PCD is an excellent way to start off the process. You do need to make sure everything is squared away prior to your trip however - also I'm not sure why your dealer can't issue your registration. There's been numerous examples of people ordering from out of state dealers and picking up at PCD. In fact that's pretty common practice on models where allocations are limited and you need to cast a wider net.