Ive been looking into sound and although t the moment i'm planning on using digital sound heres a bit about some clever sorts who have invented their own instruments

This guys called harry partch and he's made quite a few

and here is the worlds largest instrument at 3.5 acres constructed by Leland W. Sprinkle, this is up on oddmusic.com which is fantastic for these things.
I do however love this..... Stephen Schweitzer's Bikelophone

until next time brave souls