With the help of my friends Steve, Tom, and Doug, I removed the wings from the work stands and put them back in their padded cradles. We plan to mount them to the fuselage later this week.
I removed the flaps and devised a method to secure the flap hinges. (I previously split the hinges into two halves, inserted from the middle.) For the pins, I first put a 45-degree bend in each one so they would lay against the inside of the diagonal braces in the flap well. I cut small segments of spare hinge material, drilled a #40 attach hole in each tab and match-drilled these to the airplane, then enlarged the holes to #19. I installed nutplates on the undersides of the flap braces, then screwed the retention tabs and pins in place.
The screws will be accessible from the top side of the wing after the flap actuator rod is disconnected and the flaps are dropped to the 90-degree down position.