You could go with a completely different more visable color and still be scale. After WW2 Hellcats were modified to fly by radio control as guided bombs (drones). Most were painted Insignia Red with a colored tail to designate radio frequency. Yellow, Orange, Purple and blues were used for the tail. The Princeton had cat mouths painted on the nose which would break up the blue and give you some reference. Go to page 12 in the H9 Hellcat thread and you can see mine which has a cat mouth. The yellow cowl is scale and would do the same. Some (very rarely) were left in the natural Aluminum finish and coule have had a black cowl. Some were grey or various forms of camo when land based (also very rare). I have even seen pictures of captured Hellcats done in white with Jap markings on them! The British used somewhere around 500 Hellcats and they were painted in camo or various greys.