Thanks all for the nice comments!
It was more a 'testing ground' than a real guitar build project for me until I got excited and went a bit over-board with the options... :-)
I'll try and record a sound demo as it's pretty good. These pickups are very hot!

@Fretworn: I saw these when I was searching "plywood guitar" on Google! A bit extreme for me... :-)

@wokkaboy: Here's the wiring diagram I used. Got them from the Schaller website, check out HSS5
http://guitar-parts.biz/hp543126/Meg...fc049fceXY2abc

Switching diagram:
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Electrical diagram:
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Wiring diagram:
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I had to wire the Entwistle HB with green as hot and black as ground for this to work. Which is the opposite to what Entwistle show on the diagram on their website, but consistent with what they show on the pup box.... tricky! :-)