Thanks Dirt! I marked them with a pencil first, and then I used a small triangle file to follow the lines. I ditched the idea of using my die grinder, even though it gives a more "worn and damaged" look to the lines, it is too hard to control to make steady lines.
I think to tag names in messages you write out there name and link it to their profile page...that's just an assumption but I'm preeety sure that's right...
And while I'm here I must say that helmet...mm...damn fine work my friend, look forward to future progress!