Bill Frisell is a Harmonic Design Z-90 user.
From http://www.harmonicdesign.net/allpages/gibsons.html
" I had the Z-90 installed just days before I recorded 'Good Dog, Happy Man', and got sucked into its big, full sound. I wound up using it on every song."
If you don't have any cuts from "Good Dog, Happy Man," send me a private message and I can help you out with one or two so you can hear what's up. Obviously I'm not gonna violate Mr. Frisell's copyright beyond a little fair use for educational purposes. I couldn't find any YouTube clips of him where you could see whether he was playing any guitar with the Z90 installed, in part because he has this charming habit of ignoring the audience and having the time of his life interacting with the other musicians on the stage instead. Although this is a possible candidate:
[youtube=425,350]<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/Xpu33a_Y8VU&hl=en&fs=1"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/Xpu33a_Y8VU&hl=en&fs=1" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>[/youtube]
I had forgotten about the Z-90 connection on that album, but now that I am reminded, I may just have to revisit whether to go with standard single coil form factor on my as-yet-un-finalized build plans....
peace
bagman