I'm in full-on parts making mode now to have the parts to make my wings. I decided to work on the rear channel a little today. I've sheared all of the blanks, and bent one of the four needed. Using Larry Winger's spreadsheet, I was able to calculate the bends for a perfect part. Perfect 20mm flanges, and a perfect 106mm web. I'm tellin' ya, that math is good stuff. I'll finish bending the other channels soon, and build the splice. I'm working on this in conjunction with my rear ribs