Surprised no one has response to this...
I've been wondering the same thing. The best thought I've had so far is to spray components on the frame using craft spray paints from Hobbycraft. This won't completely guarantee a 'same as' finish, not least because of the lack of panelling inserts. I don't have any examples yet, but having just completed the Stoic Arms I was planning to try a match using Sarissa or TTCombat.