You didn't say if the wing-half was straight from root to the tip, or if the wing-half itself was twisted. If the wing-half itself is twisted, you might be able to "jig it up" & use heat on the covering to "straighten it. I'm thinking, if the wing is twisted & you don't staighten it first, the fix that freeair explained could make it worse. If it "is straight" then freeair is right on. !!!! I might be tottaly wrong, (somebody correct me if needed) 1degree might not be any big deal, it would be "trimmable" when you set up the ailerons. Good luck