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With the ribs on, I attached the rear spar. The second picture shows the root rib right after it was attached.

      I did forget to draw my blue drill line on the ribs. I normally use a sharpie with some tape wrapped around it that I hold flat against the table so the tip is 1/4” in the air. I then lay a rib next to it and draw a line all around.  With the ribs on, I had to make this super fancy version.  It worked great. I think I’ll keep it.