So for those that were asking dimensions I had the choice of:

Solid Aluminium Rounded Corners x 1mm Thick - 84mm x 54mm

Solid Copper Rounded Corners x 0.9mm Thick - 84mm x 54mm

Solid Brushed Copper Rounded Corners x 0.9mm Thick - 84mm x 54mm

Solid Brass Rounded Corners x 0.9mm Thick - 84mm x 54mm

Solid Stainless Steel Rounded Corners x 0.9mm Thick - 84mm x 54mm

And also those that said it's not quite completely formed I don't think any of the photos quite show the clarity. The "grain" effect on the copper in the logo is the dots of the pixels from the laser etcher, and you can see the pixels in the text too. It's pretty clear, not perfect, a few imperfections but as for the text the only character that needs a double take to read is a lower case "i" after the CG in the private key . I think the flaws could be solved by using a different font, (I used Veranda for it's legibility) perhaps another defines "i" better.

The table salt in the solution does the etching, the Copper Sulphate does the plating. Because I didn't have complete coverage with the copper, and stopped because I didn't want to over etch, next time I'll use more copper and less salt. Perhaps 6 teaspoons of Copper Sulphate and 4 teaspoons of salt (pint of warm water).

As for fire, we have an open fire at home and I don't mind putting this test piece into it, I may be month or so until it gets cold enough in the house to light it, you may have to wait for those results, the best I can do is phone the supplier of the metal and ask what the metal spec was for our best guess at a melting point, although it will of course soften before that.

I think that's answered most questions, keep 'em coming.

If you don't have or plan on getting a laser etcher, you can heat transfer laser toner to do this project cheaply too. It honestly was easy.