As far as I can tell...
We agree. We've agreed the whole time. Don't you hate it when that happens?
Except, I claim that the "peak" of the fretboard, the point where the ruler lies completely touching the jar, as you put it, varies from string to string, and has nothing to do with the thickest point on the fretboard. It's the individual string's ideal path, not the center of the fretboard, that defines where it ceases becoming farther from the fretboard when you bend. This ideal path may be closer to the center, farther from the the center, or even not on the board at all.
the flat bridge stuff and other cases you (rather diligently) argued against were ideas of situations where the thickest point on the fretboard actually defines where a string starts getting closer to the fretboard on a bend. My examples given were trying to illustrate my point, made above.
The first bit you quoted, about the model, sort of agreeing with me. You're just using CAD-speak when I'm using geometry-speak. I lost a bit in translation, but it appears you calculated (using a rather powerful calculator) the distance between a plane (?) (finding Z-coordinate, since Z=0 is a plane) and the fretboard at various points, or is it a string and the fretboard?
Have fun with your binding, the friend I'm working on my guitar with hates it...
THE CONCLUSION OF THE THREAD:
flat fretboards: never cause complex mathematical discussions. they should be made standard on all guitars.