Hello Scott
In november of 1991 an article explained a technique called "Ultra toning" to represent stressed skin in aircrafts.
After the model is painted and with decals, mark the internal structure with 1/16" to 1/32" thick lines of glosscote using a #2 brush and let it dry. Airbrush the model with dullcote let it dry and buff the surface with toilet paper.
I never used this technique but maybe could be useful to you.
Carlos