I'm always for keeping the classic cabs as original as possible, as they were back in the old days. And DK only comes in two flavours, blue and red, as far as I know at least. Yes, it may not be the best choice of colours, but that is how it is (although I like the blue color very much, I guess I am a minority). I mean, there are many, many more not that good looking cabs, take for instance most cabs with woodgrain panels like Frogger, Phoenix etc., but that is no reason to give them another color.
On the other hand, if you are talking of repro cabs, then I can understand that one chooces other colors, and this orange DK will look like a repro, so I guess it then is OK, IMHO.
One final note, Ully, think of the resale value!! Must be important.

Which arcade collector would ever want an orange DK? Oh, he could convert it of course to a DK Jr.