Started off quite easily and successfully. I had to taper the outboard ends of the rear spar caps. They taper from a depth of 20 mm down to 10 mm over the last foot of span. Easy schmeazy, especially with my new blade in my hand plane. Yay, gotta love new tools. I marked out the outline for the rear spar on my table top by snapping two chalk lines and then enhancing those lines with a marker. The spar caps were clamped down on these lines and then the rib locations were marked. At first it seemed that the rib locations were a little odd but I assumed that it was because only the outboard half of the ribs are evenly spaced while the inboard half are uniquely spaced. I then started measuring and locating where the aileron hinge mounts and their associated stiffeners go. At this point, it was clear that something wasn't right. The hinge points were not in the correct locations in relation to the ribs. Something was out, but what? After a lot of measuring, comparing, converting units and remeasuring it became obvious that I have another situation where the drawings aren't perfectly correct. The rib spacing on the drawing is incorrect. Additionally, the dimension shown for the aileron was incorrect. Ultimately, I confirmed the location of the inboard hinge mount and the neighbouring rib. From there I used the actual aileron to confirm the hinge points. Drawings may be incorrect, but the actual item never lies.