The neck pocket was cleaned up using self adhesive sand paper applied to a machinists rule for the flat faces and a small Dremel sanding drum worked by hand to clean up the curves.
With that done, I prepared for mounting the pick guard. I placed it on the body and applied blue painters tape under each of the mounting holes.
I bolted on the donor neck (not the neck ultimately destined for this guitar), strung it up and tuned it roughly to pitch, and seated the neck in the pocket by loosening each of the mounting screws about 1/8 turn.
With the neck in position, I aligned the pick guard and marked the holes with an awl. Then I took it all back off and drilled them. After removing the tape, I cleared the finish away from each hole using a Dremel tapered grinding bit, again, wielded by hand. I do this to prevent the screw from cracking and lifting the finish when installed. Which I have encountered in the past.
When I was getting the pick guard aligned, I found I was unable to get the strings aligned with the bridge pickup to my satisfaction. A closer look revealed some more work on the route was needed.
Out comes the Dremel again. I didn't want to get carried away, so I marked my line with painters tape and commenced sanding.
Hopefully I don't jinx myself here, but since this is ideally the last time the pick guard will be off for this build, I took the opportunity to connect the string ground. I took it to the toggle switch frame, simply because it was convenient.
With the pick guard back in place, it looks like the bridge pickup route should be good to go. I positioned the pickup in the cavity and marked the screw holes using, well, the screw. Then I drilled 'em.
I don't remember what I used to pad the pickups on my last Jazzmaster, but I found two sets of bonafide Jazzmaster Pickup Mounting Pads in one of my junk bins, so that's what I'm using.
Rinse and repeat for the neck pickup.
I initially intended to mount the pick guard with chrome screws, but with all the other chrome screws for the hardware on the upper bout it just looked like a CF. So I used black. Still not settled on it, I might go back to chrome.
I have re-mounted the donor neck and re-strung the guitar, and after a bit of a set up I plugged her in and went through the paces. Everything functions exactly as per the design, and she sounds great! No word on the "real" neck yet. Just for the record it is Birdseye on Birdseye with a '59 profile, and I can't wait to bolt it on there!