Having trouble finding an enclosure for your new pedal? Why not just put it inside your guitar?
This guitar has a 567 Tone Decoder IC circuit inside it that acts as a Ring Modulator with an adjustable carrier wave.
The schematic can be found at the awesome Beavis Audio Research site or right here!
I actually used this guitar live once at the ‘End of the Dial Tone Radical Experimental Collaborative Music Band Band‘ performance at the Rusty Hook in Sarasota, FL, early 2012.
Two of the three pickups were removed to make room for the circuit board. The large black knobs acts as a coarse pitch control, while the smaller black knob is a fine pitch control. The small metal switch activates the pedal.