The box is just plywood, my next harmonica heated box will be perspex with fused mitred joints. I have yet to play with vacuum forming for the interior moulding.
I gave the original to my harmonica teacher (long term loan) and I intend to swap it out with Mk2 before next winter.

This is what I was thinking in terms of cnc looms:-

https://www.digitalweaving.no/tc2-loom/
https://www.youtube.com/watch?v=UK6IqovdKLA

But they don't have the charm of the working original Jacquards I saw in Lyon about 7 years ago.

Cheers.

R

PS don't show HI or you will have your next project. (Might be a good exhibit on the SMEE stand).