Hi. I saw these in Japan last year, and I would like to make one:
Otaru_02.jpg
Apparently they're called "door harps" and when a door is opened, the hammers bounce against the wires to make notes. I'f found some examples on the internet, even plans, but nothing really discussing how to improve the sound quality.
I was wondering if anyone had some advice on how to make them sound decent - I'm not trying to get carried away - its not a guitar - but just wondering what the key elements were. Suggested materials? Size of cavity? Thickness of walls? Any thoughts appreciated.