Years ago I used to make things like this, I discovered sites like 120 years of Electronic Music[0] and the Experimental Musical Instruments Journal[1] which my local library bizarrely had and went to town. Spent a lot of time digging through the local surplus shop that was a goldmine for cheap stuff for such things. The last project I started in on was a tuning fork organ, made my own tuning forks and coils and pickups to drive them, had big dreams with it but only ended up making about an octave worth, which I had great fun with. Most of these random instruments I controlled with my old Arp Odyssey which I even added CV outs for the LFO/Envelopes so I could modulate them and ran the output into the filter input, fun times.

I might buy this, not really my interest these days but it really looks like great fun.

[0] https://120years.net

[1] https://barthopkin.com/experimental-musical-instruments-back...