Alphabettispaghetti
Club Member
The DVLA site would seem to suggest that 5 'points' from their criteria come from:
Chassis, monocoque bodyshell (body and chassis as one unit) or frame - original or new and unmodified (direct from manufacturer)
Since you can't get these for Z's that would make any complete shell swap (let's leave triggers's broom situations aside) unable to retain it's VIN legally in the UK without a DVLA inspection and approval.
I don't think we should consider the value of cars where a buyer may have been misled about the origins of the shell as this is obviously shady behaviour which the club does not condone.
Any car like that should be given a unique chassis number and put on a q plate. That’s the correct way.