Hi again, long time no see
Well, looking back at your original post (no bodywork mods) and considering the trouble finding momentary switched pots, you could possibly just remove one of the tone pots? I rarely them then on any of my guitars anyway.
As for a 'touch' system, I didn't think about it at the time, but thats not a bad idea really....You'll probably want to switch the guitar signal to ground (to silence it) using an FET rather than a relay, you don't want a slight 'click' as that will deafen you if you use distortion
Also of course relays need power, so it will drop the battery life no end. A reed switch would be nice, but FET's are easy to drive anyway. I would say the MOSFET 2n7000, but they really aren't my forte, so perhaps audioguru could stick his oar in here...JFET's anyone?
Putting any actuve electornics in a guitar can be tough, because there isn't always space for the battery..usually 9v. The active preamps in guitars are also switched on by using a stereo jack socket instead of a mono one..jsut like in guitar pedals...when you plug a mono jack,. into a stereo socket, it connects the ring to ground, which you can use to switch the power to your circuit to increase battery life.
Some links to 'simple' touch switches:
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http://www.unitechelectronics.com/NE-555-FIGURE28A.gif
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As you can see most are used to drive relays or power transistors for control purposes, but if they are 'active high' (touching the plate makes the output high) then you can jsut use FET connected between the guitar signal and ground. Touching the input will shunt the guitar signal to ground, effectively silencing the guitar. A small cap from the FET's gate to ground should make the input to the FET rise slower...preventing any audiable 'clicks' in the output.
If you don't want to use an FET, there are plenty of cheap analogue switches which will do a similar job (CD4066) or an analogue multiplexer.
Blueteeth