Take the copper sheet and use the press on letter stickers as your mask. Then use liver of sulphur to patina the copper and rinse it before peeling away the letters. That should work or use a black patina on the tinned surface the same way. After that you need to polish it with some carnuba to seal it from oxidation.

__________________
Chad
2013 Jeep Unlimited Rubicon
OBK#44
"Pleasure in the job puts perfection in the work." - Aristotle (384-322 B.C.)

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1985 300TD - Red Dragon
1986 300SDL - Coda
1991 - 300TE
1995 - E320
1985 300CD - Gladys
2006 Nissan Pathfinder LE
1998 Acura 3.0 CL