Scale length should have no effect on width at 12th fret. The 12th fret is the halfway point between nut and saddle, so the width of the fingerboard there should be the outside string spacing at the nut, plus same at saddle, divide by 2, and add the amount of “overhang” you want on the board, about ⅛” usually, but visually you want the same as you have at the nut.
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More than a few Santa Cruz’s, a few Sexauers, a Patterson, a Larrivee, a Cumpiano, and a Klepper!!
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