I'm wondering how the build is going.. I'm about to order the Precsion version for conversion.
As far as cold war colors go...
MASSTER was used up until replaced by MERDC (4 color) and one unit, 2nd Armoured Cav actually did the MERDC in digital camo... they called it DUALTEX
MASSTER
MERDC
DUALTEX - this is a masking nightmare but I pulled it off once..
The NATO 3 color didn't come into play unit much later and wouldn't be seen much until later 1980's. Also - all new vehicles are painted by robots at the factory so depicting these requires being very accurate and not the sloppy stuff you can get away with with the unit level painted vehicles that were often painted by brush - at least the highlight and black crows feet were usually painted by brush.
Usually support vehicles got last priority on updates and re-painting - so a solid OD green (FS34079) would still work depicting a neglected vehicle that never got painted at the unit level. Note that the green usually faded very quickly and requires a lot of lighteing to match the scale color.
If you go really old school - you could do one in an older green, I don't have the FS number but it's more of an old WWII Olive Drab, but much darker. They even applied oil or desel fuel to shine them up and make them parade ready. They had larger than life white stars and other gaudy markings that add a lot of color too.
I like to use the MASSTER as the colors are so bright and easy to do. You can even do this by brush if you want. A lot of leeway was left to the units discretion even though there are acutal patterns publsihed for each vehicle.