Thanks for the reply. I wouldn't build it from the Extra plans. I would kust use the Extra dihedral gauge to get the dihedral that the Extra has and then use the Extra manual to reference when joining the wing panels. The wing parts are practically identical from my research. The only differences I have found between the two wings are: differences in dihedral, the Extra has the belly pan on the wing, and the ailerons on the Extra are slightly shorter.