I have never read Kinkeads's book, but I suspect that the 15' radius in the OP is a typo and that he actually meant 25'. I cannot believe that the author advocated bracing the top with a 15' spherical radius.
If he did in fact build the top with a 15' (spherical) radius than there is no way he would have a gap of 1/8" at the end of the fretboard extension unless the neck was set at a radically steeper angle than the conventional 88.5 degrees.
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