I'm up and running 100% now and it's great. I sincerely appreciate your hard work on this Beheader, I would not have attempted it if I didn't know it could be done.
Many thanks. Following your instructions for YaBB SE, I was able to import my YaBB Gold board with the following minor limitations, which I think are minor and much more than I'd hoped for.
1) Passwords (unencoded in YaBB Gold) made it into phpBBRC & Final, but were lost on the conversion to vBulletin. Users need to use the system's lost password link to get a new one.
2) I am pretty sure that personal emails were lost I will go back and verify.
3)

tags were messed up. See my earlier post. The vBulletin convertor has some commented-out attempts at trying to correct this, but it looks like they ran into problems with the regular expressions "[" characters need to be escaped for example.
4) After reordering and correcting the boards in phpBB as suggested, upon import to vBull, everyboard was messed up and had to be renamed. Threads were okay, posts were okay.
5) I never understood what the point of the import into phpFinal was supposed to do. personally I got the same results when I skipped that step.
That's about it.
I have found a way to "include" YaBB attachments that were uploaded. It's a kluge but if anyone needs some pointers on doing that, I have a method available. I was able to bring 1000 attachment images in with my YaBB board so they can be viewed.
Contact me for details.
Regards,
Matt