"I also bought a bore scope camera with the intent of inspecting the inside of anything it will fit into, including the wing spars, wing struts and fuel tanks. More to come on the results of that."
Which system did you go with Eric? It might be prudent to do the same here. In my case, the lift struts. My spars cleaned up nicely with vinegar followed by the alodine treatment. It was a low weight option compared to the two part epoxy coating.
Depending on the results of your tank inspections, maybe two new resin formula tanks from Kitfox might be the way to go?
"Hard to believe it's been more than a month. The delay involved a failed sump pump (during a rainstorm, of course) and badly rat-damaged HVAC ducting and insulation in my parents' home."
Lol. I'm chuckling at what life throws at all of us on our journey. In my case a roof repair - found some rotten plywood while cleaning the gutters and a bathroom remodel - the last one thankfully! Looking forward to a day of nothing but Kitfox!