Began on the aft deck. The day previous I leveled the fuselage fore/aft, side to side. I placed the aft deck in position and checked for twist about a thousand times and another thousand times checking for all level. I used a laser level, my iPhone and a regular bubble level. All agreed, it was level without twist. Clamped that position carefully with several C clamps.

I made the spacers as per plans and taped them underneath the aft deck. I carefully began drilling the holes into the longerons, clecoing as I went while checking that I maintained no twist.

After I did the normal debur and such I began riveting the aft deck. I set a few with the squeezer and called it a night.