The theme of this challenge was something made from reclaimed materials costing less than $100. Thanks to all who participated!
Here are some other great entries that either went over the $ limit or did not get finished in time.
Bryan Bear's tenor uke
Hans Bezemer's 7 string headless guitar: Tuned in fifths
Warren May's Barnocaster
Peter Wilcox's two basses from a table top and floorboards
Jacob Porter's Guitar-a-lele