This latest Tinjo was commissioned for a friend of mine for his birthday (these make excellent birthday presents, hint hint). It was constructed from some scrap oak planks I found which were glued together, shaped, sanded, burnt, carved and varnished to end up with this:
The frets are simply nails chopped down and grinded to take away ane edges then glued on with araldite using an online fret calculator to get the exact position right. The tin has a basic piezo contact mic inside which is wired up to the socket.
Here’s 2 videos of it being played, one amped and one acoustic:
Here’s what it started out as
more photos of the build and finished product when you click the link
Vulpestruments 
how about building a Xylophone?