Last night I built a guitar. Ok, I put together a kit of bits. But it was quite rewarding in itself. http://nerdclub-uk.blogspot.co.uk/2016/02/playable-stratocaster-guitar.html
And after spending an hour or so this morning setting it up to play properly, it sounds great (though I’ve yet to finish the electrics and actually play it through an amp!)
So I’ve got a playable guitar and a light-up guitar neck, both working - http://nerdclub-uk.blogspot.co.uk/2015/11/testing-resin-cast-guitar-neck.html
Now I just need to get the two working together, and I can finally, actually, see where all those pesky roots, thirds and fifth notes are!