A bit of over-reaction here maybe.
So far someone has bought a 1965 Cooper 'S' in need of full restoration. That's all that has happened so far.
What he/she does with it will be up to them. One might doubt that the details will be posted on here.
There is no evidence that a different shell will be used and that existing shell is quite capable of being fully restored so long as a body jig is used. In fact I know a guy who has such a jig and I have seen worse shells than that undergoing a full and comprehensive rebuild. We are fortunate that all Mini body parts are available for such a job including a full floor, front bulkhead, etc.
It may be that another shell of a similar year will be used, but that is nothing to do with any of us. There is no material difference between any Mk.1 shell of a given year except for a hole cut in the tunnel and some small brackets in the boot, which may well just be rivetted in.
I was recently shown a 1962 Ford Anglia 1200 which was being fully restored using a donor shell from a 1961 997 Anglia. In fact it was also being fitted with a 1500 cc Cortina GT engine.
It has happened with virtually all classics and the Sunbeam Tiger Club are often asked to verify those cars as Alpine shells are often modified and used to re-shell very rusty Tigers.
That is why the FBHVC are pressing for this to be made fully acceptable and legal. It is no good going on about it on here. That won't change anything as it doesn't apply to our relatively low-value Minis, but to really high value classics (e.g. the Sunbeam Tiger mentioned above).
We should not confuse this with taking, say, a 1997 car and fitting it with a much earlier identification in order to confuse, defraud and embezzle. That is an entirely different matter which we all deplore. I say a very early registration on a late shell recently. It was obviously intended to be seen as an early car and thus tax exempt. There are those who don't know the difference and might be taken in when looking to buy their first classic car. That is the real issue here.