#2
I really don't know but that should be kind of expensive
#3
It would be expensive, and to do it you'd probably have to find a guitar customizing specialist to give you a quote on it.
#4
it would be cheaper to buy a new neck, unless of course your's is a set or beck through guitar, then you'll have to get the fret board cutomised, i'd make a guess of over £150
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