Roxy - yes.
Firstly, this class were never green. Secondly, had they been - or, going by the green livery on G601-3, the following would need amending:
1. Green frames, not black.
2. Green roof.
3. No "flying snail". No "G" ever had a snail in any livery. Instead, a large-size cabside number.
While obviously it's up to every modeller what way they want to paint their model, I have to confess to having an interest in recording what is accurate (and what isn't!) for my own interest and that of those who seek accuracy.
Unfortunately, unlike the U.K., the majority of preserved items on this island are incorrectly painted, often entirely so, sometimes just in detail.
In a private message I was asked once if I had a list of all of these. In some respects the info is worth sharing for the reasons above, but in another sense the publication of such would look or seem at best nit-picking, at worst downright churlish - especially from a former preservation activist who myself painted a GSWR coach red at Whitehead; the RPSI had no other paint available that day!