Here's the pickup and preamp. Just need a couple of 25K pots. It's a 1 watt amp I was going to use for another build. I think it'll be better run at 3V than 9V.
And the bridge blank. The clear plastic is cling-film surrounding a 3mm insert where the piezo pickup will sit. Above that will be the saddle. No need for intonation on this build.
And two supports of epoxy clay that I'm about to sand right down and finish coat with black pigmented epoxy.