Hi Systolsys.
I can't tell you about the ST models but, I my PBG ash TL (from 2018) is a finished thickness of 42mm (1-21/32"). I would speculate that it likely started at around 42mm pre-sanding etc, then ended up back there after applying the poly finish.
I think the main issue you'll encounter trying to fit a Fender MIM neck, will be the neck pocket size. The PBG pockets are bigger than Fender. IIRC, they're a workable depth, but wider and longer. Longer isn't necessarily too bad as long as the scale length works out correctly.
I have not fitted a fender neck on a PBG body myself, but maybe someone else that has first-hand experience will post.






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