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This is more of a following question than an answer.
I think if I was in this situation I would back up my phpbb database (I am only interested in users at the minute) then rename the php_users table to xoops_users, then rename the fields in the table to match those of a standard xoops_user table.
Would this work?
I would then install my XOOPS CMS the standard way and then import the XOOPS table into the database (The table that I renamed from php_user)
I don't know how 'inter-dependent' the XOOPS database is, I have never had to go too deep into it, it works fine on the whole for me, so perhaps one of you uber-intelligent guys can let me know if it would work?
I would guess that the problems may come from trying to take the PHPbb forum posts into Xoops, I think it could be done in just about the same way, but I would guess that it would take a lot longer.
Dave