Vic, I think you've summarized very well. I like your inclusion of "hand crafted" as a descriptive. "Hand filed" as a common descriptive may be a bit too much, but you're the pro writer, see how it floats. I suspect your target market is, at a minimum, a reader who has the knowledge to understand the distinctions you suggest.

Not sure if you're going to create confusion with "non-standardized." To me, the ubiquitous use of the H&H sidelock indicates standardization, but certainly not interchangeability. No doubt you are referring to the actual parts, not the design per se, but mayhaps you'll have to make that distinction perhaps more than you want lest you confuse the readers.

Best

RobC