ACF,

Your additional efforts look good. Just for your info, the wing is a three piece wing, center and 2 outer panels. The first picture below is of a UBF upper wing joint, the access panel allows the spars to be bolted together, center section to outer section. There is also an access panel near the forward spar for the same purpose as seen in photo 2. This UBF is similar to a YMF/UMF of the Original 1935 design. These GP Wacos are supposed to be modeled after the YMF-D built by Waco Classic Aircraft of recent vintage. On the WCA YMFs, the upper tank cover which forms the upper surface of the center section actually covers part of the joint, but just barely.

Ignore the above info and good luck with your maiden and future flights.