I know this is late, but some more details might be helpful. Are we talking about an electric/solidbody guitar, or an acoustic? I don't know about acoustic guitars, cuz they seem like their own thing, but with a solid body guitar, I imagine a wide chisel to get the walls straight, then sanding by hand with increasing grits of sandpaper to just clean up the surface finish. One of those sanding sponges might be helpful.
woodworking
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