The wiring is a bit weird- as one might expect! I'm terrible- well, almost completely ignorant- about electronics, but below is the drawing I sent Andy. It is not an electrical diagram, more of a very basic signal flow chart.
Each pickup has it's own three-way mini switch for coil selection, then bridge and middle each have a two-way on/off mini switch. If possible, the neck will have a three-way on/off/on, the third 'on' sending it out to a separate jack socket, for Ric-O-Sound style dual signal stuff. The main output will have a simple passive volume and tone, the neck only output would just be straight out.
Six mini switches, and two knobs, basically. To me it feels an elegantly efficient way of handling a potentially complicated setup, but this whole thing has given you a little window into how my brain works- make of it what you will! 😄