This instrument was created having three different sections. The lower section uses a circuit-bent board from a toy ray gun. The upper section uses the bent-board from a toy cell phone, and the neck section uses a "Kracklebox" or "Kraakdoos" circuit from the web (links at bottom). Each section has its own on/off switch and its own 1/4" audio output jack. This allows using different external effects for each section, mixing in different ways, for wild results.
The "Screech Axe" was fabricated using the body of a space-industrial toy guitar. It's a non-brand, probably made in China. IT was stripped and repainted a flat gray. The neck features added copper body contacts (more on the neck below).
View showing the three 1/4" audio output jacks, one for each section.
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1/8" jacks for photocell inputs for optical control.
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Thin copper sheet was cut and glued to the neck pads. Wires soldered to the backs connect to the Kracklebox circuit. A photocell can be seen in the hole, for light control.
Some links to info/schematics for the Kracklebox or Kraakdoos circuit: