2 random thoughts.
for the safety selector, have safe be a lump of coal, and fire be a flame?
also, not sure how this could be used, but when I think of coal, I think of diamonds. Maybe a diamond set in the tip of the front sight post, kinda like an earring?
I'm a fan of the idea of incorporating raw materials from the company into the actual gun. Like timbers from the original mine, metal from the first machine, etc. Make it look low-key, maybe have the standard profile of an A2, but upon closer inspection and with some explanation, be able to show how it incorporates the history of the company.
For the main working parts, barrel, lower, parts, buffer tube, you could use standard kit. Top of the line, of course, but still pre-fab. But for the exposed surfaces, handguard, grip and stock, you could work in the custom parts? I saw that lamp and right away i thought it could be made into a foregrip and flash hider.