Myself, Cutter and maybe some others shared a bunch of ideas about a medallion but I don't believe anyone actually made one ((yet)
There are some pics etc in the 357 build thread. (Towards the end)
I will get to it sometime, other projects keep coming up. I bought a 24Krpm spindle to mount on my bridgeport as a sub-spindle to do fine detailing and engraving with this in mind.