I still want to be able to make fully custom skins, so long as they match a given markings scheme (like, a custom skin for a PTO USN/USMC bird c. 1942 MUST have the blue-gray/light-gray colors, etc).
Either that, make the "Default" skin a generic one. National insignia and color scheme only, with NO individual plane markings (numbers, killboards, nose art, etc). That way there's nothing to obscure the custom nose art.