About a year ago, I started building a cigar box guitar for a friend of mine as a commissioned piece. It was my first CBG, but not the first instrument I built. It's called Zigarrocaster №1 (composite of the German word for cigar, Zigarre, and the obvious "caster" of Strato- and Tele-fame)
The most expensive parts were the neck (mahogany) and fingerboard wood (rosewood) at around €30 each. The box I got for €1 at a local tobacco shop.
This is what it looks like, enjoy!
I'd also like to take the opportunity to plug my tumblr