I began by finishing the attachment of the flap and aileron drive linkages to the spars on the left wing.
Then I found something that I overlooked when assembling the spar...I had forgotten to rivet on the tip rib attach angle. So I found them, laying on the shelf where I had left them, lined them up; drilled, deburred and riveted them on to the spar. I then clamped the double root rib to the spars as well as the tip rib.