Opened the holes in the 36.5 and 39.5 ribs so the the spar attach features would fit through. Installed ribs and pushed spar attach bolts as far into the holes as could be done by hand as shown in Image 1 and 2. (bolts are a very tight fit and may need to be chilled/tapped when final assembled....hopefully they are not too tight). Image 3 shows the aft spar riveted and installed. 1/4 attach bolt reamed to full size and other details finished.
