Funny you should ask Lucas,
I was curious as to the finish on the LG doors and bays and wrote to the Smithsonian to ask about it. What I got back was a partial copy of the restoration guidlines (dated 25 October 1983!) authored by none other then Mr Robert C. Mikesh, Senior Curator. Interesting stuff.
Here are his paint suggestions;
External, upper: Black Green (N.1) Munsell 10 GY 2/2
External, lower surfaces, wheel wells and covers: Light Gray (N.10) Munsell 7.5/
Propeller and spinner: Brown (N.12) Munsell 10 R 2/3
Wing leading edge and propeller tip markings: Yellow (N.14) Munsell 10 YR 7/14
Insignia and warning: Red (N.20) Munsell 5 R 4/12
Cockpit: Interior Green (N.5) 10 Y 4/4
Landing Gear: Flat Black
Enjoy!
Regards, Jim