Re: Cretinous idea - The combined volume pot and mains SW.
It is also poor practice to runs mains wiring up to a control panel area with signal control switches on it, both from the perspective of hum pickup & and electrical safety. I think they even recommend against this practice in Horowitz & Hill in the construction section.
It's better to have the mains power switch on the rear of the instrument and this is where switched & fused IEC sockets come in handy.
Some manufacturers like Tektronix & Philips got around this issue in their instruments by having the power button connected to a long plastic arm and the mains switch itself nearer the rear of the instrument. Also another trend was that the power button has a passive mechanical optical indicator that changes when pushed.
For all of my mains powered projects now I just used the switched & fused IEC socket on the rear panel.
I don't think it's legal to switch the neutral alone.
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