Picture of civilian DC-3 Cockpit here:
http://www.airliners.net/photo/0881388/L/
You should be able to get a good color sample off of the picture. Gray instrument panel could make a nice distinction from C-47 and other DC-3 variants, but black was just as common.
Zinc Chromate primer is naturally yellow-green, but when applied to aluminum is apple green. A bit of black paint was often added to make it more ultraviolet resistant, so the color could be darker - almost olive drab. It also gets darker as it oxidizes. So, your choice of colors as long as it's ugly green!
This color will work just fine:
http://www.art-paints.com/Paints/Ena...c-Chromate.gif
Here are a couple of color C-47 cockpits which show variants of Zinc Chromate primer. Note the variations! I'm starting to get the sense that no two C-47 cockpits were the same!
http://www.wingsmuseum.co.uk/images/DSCF0875.jpg
http://www.militaryfactory.com/cockp...uglas-c47d.jpg
Way too much information about interior paint colors of US Aircraft:
http://www.ipmsstockholm.org/magazin...colours_us.htm