Thanks Dave !
There are not too many parts in this one. Here are some pictures of the plastic.
I also included a photo of one of the reference books I will use. It's the A6M Zero in action by Squadron.
It looks like Koga's Zero was a Mitsubishi built A6M2, model 21. The serial number was 4593, and it was completed on February 19th, 1942. The tail code was "DI-108" in red letters. Mitsubishi ended production of the model 21 in June of 1942.
My research is showing that the cowling (inside and out), along with the area under the canopy was painted in a dark "Blue Black" color. The closest thing found to FS numbers for this is FS 25042, (which is very close to WW2 US Navy Dark Sea Blue, only not as flat in sheen).
The interior of the wheel wells and landing gear covers were the same color as the exterior and this was not an exact match either to the current FS color standards. On line research has the color listed as FS 24201 and FS 16350 which are very close in shade to each other. The color was supposedly closer to the later, FS 16350. These colors are also pretty close the German RLM 02.
The Nakajima built planes had the transparent blue "Aotake" color in the wheel wells and landing gear covers, and this is not correct for Mitsubishi built Zeros.
After some more online research about the cockpit colors, like Tom Cleaver stated, there were two different shades of green used on the A6M2. It depended upon what manufacturer built the planes. Mitsubishi used one color while Nakajima used another. The Nakajima planes used a lighter shade of green.
It looks like a very close approximation of Mitsubishi interior green is FS 34096. Just so happens that I have a bottle of Model Master enamel in that exact shade. Looks like we're off and running.
10 attached images. Click to enlarge.