Draw lines down center of ribs 5/16, draw line down center of rear spar 7/16 from the front of rear spar IMPORTANT!
With help from my wife I installed outer wing skin P2404 temporary to see if everything was lining up straight and square. WHOOHOO it did:)
I then drilled the outboard r rear spar hole (bottom corner) to help set everything. Clamped and taped skin to front spar and clamped bottom of the skins to rear spar algining with the 7/16 rear spar line.
Started drilling skin with #40 at rear spar checking 7/16 ref line.
