The point remains this is a series production model--not analogous to a unique painting.
The implication being that it would be OK to re-color a Picasso print, but not a Picasso painting ?
Fortunately Dr. Simeone offers the appropriate prescriptions: Coachbuilt Press | The Stewardship of Historically Important Automobiles
But in this particular case, I think a tasteful and thoughtfully-chosen variation led to a more attractive car, that brought more money, that will encourage the preservation and appropriate restoration of more of its type. All good.
But that stray pipe wrench depicted in the tool kit still makes me cringe . . .