Mated thge two halvs of the fuselage. All of the holes for the bolts were drilled undersiize and then reamed for a tight fit. I did not put the NAS bolts through the bottom yet as I didnt want to keep putting them in and taking them out for fear of enlarging the holes until I permanently put the bottom skin on. It probably took me longer than it should have, but I was kind of anal about getting it level and strights.