It looks pretty cool. I have actually been thinking about making something like this for myself
However I didn't understand what your material was. I know it is Stainless Steel, but you didn't say what exactly. Like what type, also what was the diameters, specifically the thickness.
I currently am in possession of a couple of plates with 1.5 mm thickness of AISI 420 (1500°C=2732F) , AISI 304 (1450°C=2650F), and another one that i have forgotten what it is but it is one of those Ferritic SS
which one do you think is best to use here?
I also would like to add that your end result has a couple of flaws. For instance your 3rd character in your address is wrong. you put "I" instead of "i" and your private key is not properly etched, in second line at the end there are 2 unreadable characters (it is easy to guess or even brute force it though).
What do you think was the reason, and what should we do to avoid it?