At first I had a problem with the Right Wing hole alignment until I realized that the Right Wing Walk Doubler was on backwards. Flipped it over and everything aligned perfectly. The error was to the fact that I failed to mark up the doubler. One side looks just like the other and unless the parts are maked, it often hard to tell which side is which. The plans only show the Left Wing detail. The Right Wing is essentially a mirror image and sometimes I need to check the drawings two or three times before it makes sense. The two large top skins (W902 and W903) were clecoed to the Left Wing Skeleton along with the Wing walk Doubler. Attention to removing any downward bowing of the Wing Spar in the Wing Stand is important in aligning the skins.