John, I now realize that by attaching an image of the complete wing I may have create some confusion. The correct sequence is to build the spar without gluing on the two RS-561 gusset at the root of the rear spar. Then when you assemble the wing you slide from the root end the ribs 2 to 5, and you slide from the tip end the ribs 6 to 10. After that you glue the two gussets to the rear spar, then you need to modify rib 1 and tip rib to slide those in over the gussets, see photo attached. The two RS-1 doublers shown in the photo are not in the plans, but I think it is a good idea.
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