PHOTOS 1, 2 & 3: Remainder of the ribs, top main spar and top rear balsa spar glued in place. Trimmed the main spar doubler back about 1/8" to fit properly above the first W5 rib. Glued these two spars in with thin CA, and when I unpin the left wing panel from the building board I am going to reglue all the necessary top main and top rear spar joints with Titebond II. Will also glue all the shear webs to the tops of these two spars after removing the wing panel from the building board as it is much easier doing it this way than it is to try to do it upside down while still pinned to the board.

PHOTOS 4 & 5: Top and bottom spars squared with each other at root end of wing panel.

PHOTOS 6, 7 & 8: Pre-shaped balsa leading edge glued in place with Titebond II and clamped til dry. Taking a coffee break until the drying is complete.