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estebanana -> RE: Back and sides are twisted (Apr. 19 2017 3:39:34)
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Too much moisture bending the ribs. The waves don't look too bad however. If ribs are thick enough you can sand that out with a hard flat sanding block right before you cut the binding channel.
If the ribs are already really thin and unassembled- You can create a laminating jig shaped like a rib and glue thin maple veneer to the inside of the rib to give it more thickness then carefully sand out the waves.
Or leave the waves. In cello making some makers would simply go with that because it's part of the game and it look natural. Guitar making has it's priorities in the wrong place on stuff like that.
Another option is to glue cloth tape to the inside of the rib for extra strength. A common practice in steel string construction.
Buyers will question it, so I recommend fixing it. But in the bigger picture guitar making suffers from boring flat planes, but only a minority of viewers think that is true.
If you need help with any of those solutions let us know.
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You have to plane the braces off the back, clean the glue residue, make new braces and reglue them.
Make sure the braces are strong wood. Arch them carefully. and most important check your glue up area to make sure the room is dry. Under 50% relative humidity.
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