The metal work is, if anything, the easiest part (although repeatability does become an issue if you start getting exotic with it). It's the logistical part that worries me - the faceplate swaps and the various hardware behind/on the faceplates. A thin stamped "skin" of aluminum would solve that, but it would be just about impossible to achieve as nice a look as a thick machined faceplate. It would forever look like a "skin".