... Greetings ... :
Very good question and topic.
To be truthful with you all, I was always looking around for this build since it was posted a few months ago.
I actually thought it was done by now.
I do believe I sent you a PM on this matter a few months ago when the post was made.
I am of the same opinion as that of JAYMICHAELSDESIGN.
One always paints the model, no matter what, even if the mold is very close to the color.
It has been my experience, that the unpainted plastic WILL always change it's color as time and years passes by.
Black will end up with a grayish or yellowish hue . Yellow will turn a bit darker, white will end up having a yellowish hue, blue will end up with a stone gray or stone blue hue,
and so on with the other colors.
Nice work , good eye candy... .
Always did like those KODAK cars.