That's a very dynamic livery ( reminds me of a JPS Lotus :) ). DRGW had some fantastic livery designs.
Not entirely sure what to do about the roof of this boxcar, taking the shading off completely makes it a bit flat, but you can't really do new shading without something to work from ( unless you're totally insane and do it with trial & error ) and the original just won't line up right.

Bit flat & featureless, hm?