You're great when it comes down to material. I like how you make your previews too.

 Snazzy! I generally don't like ditherish shading, but this won me over. XD Great job.

 voted for you too

 I loved this one. Voted! :)

 Got my vote, looks nice

If this were a real font, would it be called Metallica?

Nice work though, my favourite of the challenge :)

That's very flattering, thank you.

Nice dithering on those, it works well without overwhelming the piece. The palettes remind me a bit of Jinn's work. :)

I really, really, really like this. To bad it is not an actual font I could download... I would love to see it completed.

Well done.
You might increase the brightness of the edges, and even more so the corners, as that's where the wear mostly happens on metal making it shiny. Refs: 1, 2.

looks amazing

 really nice bro!