I decided to have the cover for my Challenger 4P which was fabricated at LASERBOOST (see Getting a Second Skin and Metal Magic) powder coated at a local shop (Westex Coatings Inc.). I just got the piece back today and I'm very happy with the result.
With the proliferation of 3D printers, the 3D printed "skins" I have designed for this and my other reproductions, are easily within the reach of a large number of makers. Now, companies like LASERBOOST are making sheet metal fabrication more accessible as well. Even though my reproductions for the most part have emulated "insides", I have always strived to make the exteriors match as close to the original's as possible. My new sheet metal skin goes a long way towards achieving that authenticity for the Challenger 4P.