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The harp guitar I build has a 25.5 scale length. 12 fret. I want a 14 fret. I realize I will have to stretch the harp neck to keep things on proportion, maybe an inch? But I do not want to move sound hole or bridge placement. At most, I have about 3.75" from 14th fret to soundhole. I would like at least 18-20 frets. Is this possible?

Mike,

The easiest thing to do is just change the body shape in the upper bout area through to the treble side of the hollow arm bringing the join down by two frets - you might have to alter the upper bought bracing a little but not much. Everything else stays the same. You loose a little body volume but no more than you would if you used a cutaway.

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Dave White
De Faoite Stringed Instruments
". . . the one thing a machine just can't do is give you character and personalities and sometimes that comes with flaws, but it always comes with humanity" Monty Don talking about hand weaving, "Mastercrafts", Weaving, BBC March 2010

As was stated on the previous post you have 2 choices , change the body or move the bracing. You braces are scale length oriented so you have to adjust for that. To use a 12 fret body and make it a 14 fret the soundhole will have to move and braces .

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John Hall
blues creek guitars
Authorized CF Martin Repair
Co President of ASIA
You Don't know what you don't know until you know it