Just catching up Evan, and nice to see something unusual, and it's looking good so far.
Re the wing thinning on the interior - when I've done similar jobs, I first "shave" the surface in repeated, continuous "swipes", using the back of a new scalpel blade, held flat against the surface, at an angle of about 45 degrees.
Once done, the surface is then lightly flat-sanded.
The technique can also be used on the extreme trailing edge externally, if required, where the very tip of the edge is thinned, but the remainder is left untouched.
I used this technique to thin the exposed, open cowl edges on my current B-24 build.