Finished the wing uprights by sizing, match-drilling and clecoing the left wing uprights.
Started and completed both upright channels. The upright channels attach to the rear frame and are also attached to where the rear side skins meet the fuselage skins. They also have a secondary role of supporting some of the structures that hold up the seat backs.
Lastly, I fit the two gussets that support the instrument panel to the upper longerons and installed the instrument panel to them.
The left side wing uprights in place on the left side now.
The left side upright channel after attaching to the left skins and rear channel.
The instrument panel drilled and clecoed in place.