The Plans I have show nothing and the Instructions I have are the same as the ones posted above. Do you have any others possibly? I checked my wing again with a 6 foot straight edge and it appears to be straight. Although when built I put 1 inch blocks under each wing tip. Now that the wing is complete and the wing pan is installed it is difficult to check exactly.

I set my wing on the table level and used my laser level and there seems to be about 1/4" away from straight flat on the trailing edge. The top is flat.