Known in OZ as the Bush Bass, We used one (teachest type) in a bush band "Bludger O'Toole" The player used to complain that it was very damaging to his plucking finger until we hung a microphone (Sure SM57) inside. Together with a lagerphone (see previous thread) it contributird to a driving rythm section.
Select suitable wooden teachest.
Attach a rubber crutch tip to a corner of the teachest
Get a broom handle cut a groove in one end
Cut the broom handle to a comfortable length to hold in the crutch tip
Drill a hole in centre of the top(ex bottom) of the tea chest and thread a stout string through the hole.
Tie a suitable stopper (stick) to the end of the string inside the box and tie the other end to the room handle.
Hold broom handle in left hand
Put right foot up on tea chest
Pluck string with index finger of right hand ( a leather fingerstall is a good idea)
Vary tension of string(get right note :-)) by varying pull with left hand