instruments to build

a bow-waterphone
a zero-input mixer
a fader thereminvox (with different waveshapes/fader, perhaps), a strip-resistor theremin, and a regular theremin
a tin-can thumb piano (different sizes)
a rubber-band banjo (out of the ocean drum)
a 3rd-bridge hurdy-gurdy, perhaps one with a resonating chamber

i need to learn how to construct my own bellows, reeds (perhaps out of rubber cloth), and resonating chambers. i need to dig up my highschool physics 20 notes about open/closed tubes.