I might be able to make one of whatever final coin design you decide on. Tried to just render something real quick that was close to Shadow Runner's design.
I like it, I do like what Shadow_Runner made, maybe if you can incorporate the "E" with the circuitry in it, that could look pretty nice!
Side Note:
Difficulty is now up to 16!
I drew up a similar schematic for a 2d version if this helps.