Joe, I don't know if this is helping or hindering.
I have a stamped VIN plate which, like Bob's, sits in the left fender behind the wheel arch. It is fixed to the bracket on which sit three relays. It is fixed with two small Philips head screws and the plate is body colour (like the bracket on which it is mounted). The impressions on the plate are proud of the base by 1-2mm.
I then have the VIN plate which sits on the firewall (left hand side looking in to the engine bay). It is fixed to the firewall with two slightly larger Philips head screws, and requires a cutout in the sound dampening material to be visible. It is on the matt side of satin black on the surface, with blocks left in bare metal for 'discrete' numbers. The numbers are then etched into the VIN. Words are printed in a matt silver colour very close to bare metal colour: numbers (model code, model designation, vehicle weight etc.) are etched as black on the bare metal background of the blocks following the text. The last eight digits of the VIN (designating left or right hand drive, and vehicle production number) are stamped proud, as on the other plate.
Given the small size of the text and the particular font used, I think it would be a seriously difficult task to replicate the data on the VIN. Photo-etching maybe? Create a decal perhaps? I'd be fascinated to know what you decide, and how you get on.
Clear as mud? Sorry if this is not the answer you were hoping for,
Cheers,
kns.
1965 230SL, Manual
[1965 220SEb Coupe, Man.]