Noticing a fair amount of ka'athyra / Vulcan harp discussion going around, so here's the working model I got to see back in Feb. 2020 at a very brief K/S gallery show in Chicago. (And no... I did not get to play it, much as I wanted to.) 💙✨️🎵 One of the staff at the gallery did turn it on (it has an electronic tone generator and amplifier built into it) and pluck a few strings to demonstrate the sound; it was perfectly eerie-but-beautiful.
(back view)
(proof that I was really there... in the pre-Kirk-'do times)
(ps - there are step by step instructions with schematics online for building/wiring one yourself, but you didn't hear that from me)