Back at the Jazzmaster...
I removed the neck to measure various things.
The necks were an exact match. 21mm of neck from end to fretboard

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But about 2mm extra thickness on that fretboard!
Also, whilst daydreaming today I realized that I did indeed have to dig into the body-ward, more difficult end of the neck pocket in order to remedy the crazy-a$$ situation I had going with the gap between pick guard and string. Again, you all probably realized this and were just waiting for me to figure it out.
After measuring it appeared as though I had about 3mm of pocket to remove (not including the extra thickness on fretboard...we will see where I net out)
...in as exact as an angle as I could eyeball without a protractor, using my rudimentary basement tools.
So I got to chiseling and rasping and filing and measuring and chiseling and rasping and filing and measuring....etc.

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It was hard to be patient and work slow, that is not my rock-n-roll MO.
But it turned out well

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Much more appropriate. And that bridge is flat on the body, with the faux-string resting on the fretboard, so I have some room to mess with.

Life happened a bit tonight, so that was basically all I had time to do
But I did want to try out my nifty new nut files. So, although this looks god awful, it was mainly a proof of concept to see if filing would get the gauges to where they needed to be

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I am going to upgrade to a bone nut before the end of this build
Next time I attack a nut with the files I will have some sort of jig set up to make sure the files go straight down the neck, and stay at the right angle.

All for now! back for more in the next couple days.