Just had a thought ...
It just struck me ...on the body of an acoustic guitar, there are three, and only three, areas where absolute flatness is required ... on all other areas , curves rule OK ..
A: Most importantly, the surface on the upper bout where the neck heel shoulders contact the ribs needs to be absolutely flat (as of course do the neck heel shoulders) ... unless ... the heel has a parallel contour rather than a "V" contour.
B: The area underneath the glued fretboard extension would preferably be dead flat.
C : The base of the saddle slot should be dead flat.
On the neck, things are slightly different, naturally ..I am only referencing the body of the guitar.
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