I really have to sound like an old bloke here and say, "Ah, the good old days".
Things were a lot more difficult identifying these cars in the eighties and nineties. Credible information was very limited, held by a very few and referred to as "My Precious".
Walking around in 1989 there were hundreds of GTRs, XU-1s, GTSs and thousands of A9Xs & GTs.
All of them were 'genuine' and verified by a bloke whose mate had almost bought one last year.
I remember Street Machine doing an article on how to spot a muscle car replica and then following that article, another article on how to biuld your own replica.
I have a 7/73 tangerine / chestnut XU-1 which I bought in 1989 as a rolling shell with tags. Everyone (all the experts) said it was a fake because of the interior as it was widely known in 1989 that XU-1s only ever came out with a black interior. Also, I was an idiot for buying a car without a motor.
I remember in 1986 that someone I knew bought a stunning LJ GTR purple / white interior. You should have seen this car; bog stock, mint condition. The whole drive train went to the tip because no-one wanted it and the GTR was then 350 Chevved, this was very typical, and the interior was painted black.
So, yes people did a lot of things to these cars because back then they numerous and unwanted. Now, the information is available, the cars are rare and can be verified, the experts seem to be real (this site is fantastic) and people want to now save these cars.
Keep up the good work.
Just my two cents worth, thanks, Bruce