I drilled the upper longerons on the left side of the fuse then moved to the right. I drilled the upper longeron on the right side, then moved the to the #40 holes. They are complete with the exception of the holes that needed a drill bit as I was using a reamer. Then I moved to the #30's with a reamer. The lower holes needed the mid length(~8 inch) drill bit to get to the holes without the chuck maring the belly skin. There are a few #40 holes that also remain on the bottom.