A lesson from having my wings inspected:
One thing to look for: With the skeleton assembly of the rear strut support, make sure that the piece of (l) angle that helps connect the trailing edge skin does not interfere with the middle line of rivets.
This is the best picture of the issue I have:
The rivets need to be drilled out and the area near the rivets needs to be filed into a a circular shape so the metal does not rub against and cut the rivets.
The other thing to look out for is the fit of the root skin. You do not want a perfect fit between the wing and root skins. They will shift and rub against each other in flight and is a potential source of cracking. Make sure you have a gap between the skins and then use sealer later.