I have the earlier kit, which I purchased in the early 2000’s, before they changed the hull. I purchased drawings, done by John Braynaert, who had built a model for one of the New England Maritime Museums before Dumas started producing the kit.
Don’t know how much you have relied on the internet, but there a lot of colored postcards, many of them ‘colorized’ black and white pictures.
However, the last picture I posted is of a model completed the night before Mt Washington burned, so it should be pretty accurate for her later years. The next picture is a close-up if a paddle box, which does not show its interior colors. The next picture is the kit model, and the colors are very accurate, with green side rails and trim. I have not seen any information about the insides of the paddle boxes, but they could be black or white.