As I said in my intro Hi everyone in the Say Hello room, I'm not making jewellery just yet, but this is one of the things I've done.
The body is covered with heat treated thin steel sheet, and I made all the hardware ( Bridge/Saddles/cover plates etc) out of S/S and brass, with bits of copper tube thrown in, and LED's. The back of the neck is covered with copper leaf.
Full size and fully working. I might even post a You Tube link of me playing it ( not very well!) sometime.
I suppose it could be classed as jewellery, if you want a VERY large necklace
That's as long as I've worked out how to put pics up here properly.