First photo shows attachment of skin to bottom spar while the wing is upside down.
Second photo shows skin on and curing after flipping wing back over to right side up. I did not staple anywhere except lower spar. Third photo notes placement of temporary compression member in 2nd rib bay to prevent pulling spars together with strap pressure where the 2nd rib has previously been removed for larger fuel tank placement. I'm actually getting excited about building again. I need to drill holes for forward strut brace fitting before I can epoxy center leading edge skin in place.