Here's Drew's mockup of what I think will be the final rosette in CAD:
I did a light Photoshop mockup using HRW radial as the wood and filling in the 3/32" abalone strip:
I'm hoping it comes out as nicely as I'm imagining it to be... Drew's never done a bound soundhole in his own builds, so this will be a first for him--but he was definitely willing. He's been so great to work with.