Sure, that's a step by step tutorial that addresses switching from phpbb to
vB, hidden on the forums somewhere. What I'm saying is that something more concise (and generically named so that folks know that that procedure applies to them) should be in the official user documentation that is linked to from the customer area. Heck, once my situation is figured out I'd be happy to contribute some documentation for the process.
I'll go back to my pre-Xenforo database and try to do the install and reintegration again.
Thanks for your help so far!