This is an easy variation of the cigar box guitar but with a buzzing bridge to make sounds reminiscent of a sitar drone. One of the great things about this project is that there are no critical measurements, almost any configuration will work just fine. The resonating cavity doesn't have to be a cigar box, It can be anything from cookie tins, hardhats to the traditional gourd.
My inspiration for this project is: http://dennishavlena.com/tamboura.htm
The tamboura (tambura, tampura, tanpuras) is an Indian fretless drone lute. The strings have a thread tied on to them to dampen the primary tone but allow the harmonic overtones to ring. Tambouras are tuned in unison with some strings as a 5th above the root note.