Easier going the other way, steel to nylon. So pull frets, take an iron and heat off the fretboard. A jig to run a router down the center of the neck for the truss rod slot. Take a router to the inside of the top to cut it out. A jig and router or careful work with a chisel to get the rest of the top off. Make the top and drop in, some purfling and binding. Plug the tuner holes and redrill. Install truss rod, attach fretboard. Fret markers? A little bit of finishing?
No problem.
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Fred
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