With all the modifications in place, I can now setup the guitar. The new setup is going to unstop the tremolo - but since that's something I'll also have to do for the Black Strat, I need to get acquainted with the theory and practice of properly floating a Stratocaster tremolo.
All the groundwork is now done and the guitar is ready for the new pickups and wiring. I just need to check on the scratchplate fit at the bridge first. UPDATE: Idiot wiring mistakes identified and rectified.