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After the rear spar tunnel assembly, I decided to make one assembly of the aft cabin details.  I saw someone else do this and it seemed like it would be much easier to do outside of the fuselage.  It was.

In the first two pictures I am just assembling all the pieces, including the rear spar tunnel assembly that I just made. I did this to make sure everything was all lined up with the pieces it attaches to.

In the remaining pictures, I start to rivet the pieces together.  However, none of the pieces are riveted to the skin or the rear spar tunnel assembly. The finished assembly is shown in the last picture.