Anyone do any brass CNC carving on the Shapeoko at this level of detail - is it doable (~2in diameter)?
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It’s somewhat doable. However the corners where they are sharp won’t be able to be cut exactly that way. You may be better off printing in castable resin and doing a pour. However you won’t be able to do brass due to the zinc content.
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There’s also the Nomad as an option at that scale.
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The nomad can do this sort of . So can the sherline cnc, although cam is easier on the nomad. I agree with Tim that casing in bronze will make it look more like a coin . It will look cnc engraved form a cnc machine . Much better to cast it .
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I think the best bet is to 3D print it in wax resin and cast in bronze. Here’s what I think the CAD would look like:
Since I’ve already done the solid model, I can create .stl from this and send it to you if you want. EDIT: now that I see it’s a copyrighted design, it’s probably inappropriate for me to share the model. Sure wish I had seen that before I modeled it. 
EDIT: Perhaps you can just get it from the manufacturer. It’s token number 1521, near the bottom of that section.
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Yeah, sorry you went through all that. I was not wanting to make that coin, but something like it which I haven’t designed yet. Anyway, pretty impressive.
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That’s a shame. I actually thought it was a cool coin. 