John,
The car looks simply fantastic, I've been itching to see the latest photos.
I wouldn't fret over the colour - we notice in our bodyshop that there are always slight variences, some manufacturer colours will have a number of shades for the same paint code and there will also be differences between batches and paint manufacturers. This would certainly have been the case when the cars were being built so there would have been variations from new. Even cars with original paint won't be the same colour now as they were 40 years ago.
It also really surprises me how different the colour can look on a car once it been fitted up with the interior and glass back in. In my subjective opinion your car looks pretty perfect as it is.
I probably wouldn't have bothered but I suspected you would change the B post.
Can't wait to see more. Very well done.
Darren