Kyboshed

[nominous]

I'm not sure I'm following you.
You said:

if its mint.. why not swap out EVERYTHING on the TD into it and reregister it with a colour change..
you can keep the original registration, go for a respray and replace the chassis plates..
the spec for the TD will not have changed, the power and running gear also.

So that's keeping the TD running gear, switching the chassis over.
Which surely means swapping the VIN plates too.
Or you mean change the chassis number on the TD's V5 for the NAD chassis number ?

Either way, it's still a modified car.