Looking good, when you get around to wiring for the coil tap, don’t go directly to earth. Instead go through a capacitor, the value of the cap will control the amount of treble you bleed to earth on the tapped coil, this method will leave the pickup in humbucking mode and avoids the massive drop in volume that a straight to earth tap gives. As a general guide I normally use a 22 cap on guitars and a 47 on bass, when I use this method, mainly because these are the standard values in my parts drawer, anything between 010-050 caps will work with different effect depending on the humbucker that you have. Looking forward to what happens next, keep safe, Mike.