Understood :).  BTW, I've been playing with the latest script you posted and have at least one comment.... if the printout for the regions of missed matches is correct, then your find_regions() routine appears to be broken.  

I'm still trying to track it down, but it's reporting vertices that live in the back/top/left trying to match with regions in the front/right/bottom  (it always seems to be polar opposites).

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