RE: Screwed up!
If I am smart (usually not) I will let my brother look at it before I do anything, he is really good at being able to see the easiest way to fix something.
The last time I screwed up I ordered a replacement kit because I had screwed up the wing in a big way. He took one look at it and said "Its symetrical, right ?" I said yeah, he said "Flip it over, glue a stick to the root rib and run it through the table saw to set the angle".
Too bad I didn't wait since his suggestion worked great, of course "someday" I will build the second kit of that same plane :-)~