101 Layout
The Harrison Instruments site ain’t too much to look at, but they do have the biggest selection of Theremin kits I’ve ran across. A Theremin is one of the first electronic instruments, it uses radio frequencies to make noise as your hands get closer to it… Link.

Theremins galore!:
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DIY RCA Theremin Replica – Link.

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HOW TO – Make a Theremin – Link.

What is a Theremin? – Link.

HOW TO – Make a Radio Shack optical Theremin – Link.

Optical theremin + soapdish – Link.