Final-drilled main and leading edge ribs to front and rear spars for both wings. NOTE: On the left wing the two 712L ribs' holes did not align with the front spar holes. I tried the 712L from the right wing tip, but it didn't align either. The holes were off by less than a diameter. To correct, I drilled the 712L ribs to match the spar and then fabricated doubler plates from 0.025 sheet stock. These were placed aft of the 712L rib webs and match drilled to the front-spar/rib assembly.
