The last couple of steps for the buildup of the HS involve drilling the HS-404 and HS-405 ribs, HS-710 and HS-714 reinforcements to the HS-702 front spar and HS-901PP skin.

The instructions in this part are pretty ambigous... For the first time, really. We highly suggest using the HS assembly as a reference for hole-measurements instead of the detail section on the plans. Same goes for the trimming of the 404 and 405 ribs... For once, not strictly following the instructions step by step may keep you out of trouble...