I think the reason there aren't any more repaints is that the base textures are extremely difficult to work with because of all the painted-on detail - and they're the wrong base color for any authentic pre-war skins. The original paint jobs have pre-war markings over a basic color scheme of overall light gray, and that's completely wrong. There was a period in the late 1920s and early thirties when the Navy painted its planes with light gray on the metal surfaces (only) but that practice ended well before the first Duck rolled out of the prototype shop. Fabric surfaces like the wings were never painted gray until the introduction of camouflage just before WW2.
One of the skins that comes with the plane depicts a Duck in the Philippines very early in the war, and overall gray is correct for that period. One could change some markings and make other early war skins, but they wouldn't look much different, and that very briefly used overall light gray scheme was, to me at least, the most boring color scheme the Navy ever used.
There is also a skin depicting the plane from the movie Murphy's War, a civilian British livery that's probably unique to the movie, but the overall color is a shade of blue that wouldn't serve as a basis of any authentic wartime camouflage schemes, not even the late war and post war overall Dark Sea Blue scheme.
Ever since I downloaded the plane I've wanted to paint at least one authentic pre-war skin, but the prospect is daunting. There are no less than seven separate texture files for just the fuselage/float alone, but the big thing is all the painted-on detail. Changing the colors without losing all that beautiful detail would be a major job, perhaps beyond my skills. Several times I've dug out the model and tried to get started, only to throw up my hands and put the job aside for another time.
It's sad, because the Duck is one of my all time favorite pre-war Navy planes, and pre-war Navy is my all time favorite modeling genre. It pains me that the only accurate skins that come with the plane are the wartime one I mentioned above, the fictional movie skin, and one that depicts a contemporary civilian warbird in that grossly incorrect overall gray scheme. Augh!!!!!
Some day I suppose I'll get around to working up a base scheme in authentic silver paint (a color that's always given me fits anyway - I find it extremely difficult to depict metallic silver paint without having it look like bare metal.) But it might be a very long time before I manage it, so I sure hope someone else will get to it first. But it's been a long time and nobody's done so yet...
Of course it wouldn't be necessary to depict metallic silver if one were to paint wartime camo schemes or late/post war dark sea blue skins, but there would still be the more difficult matter of all that painted-on detail. (sigh)