Won't call myself an expert by any stretch, I've only spent about a year shadowing a small aircraft mechanic. He was only 3ft tall. Okay... jokes aside... I've witnessed "abandoned" aircraft restored to airworthy-ness. "Abandoned" with quotes because someone owned it, but just hasn't taken it out of the climate controlled hangar in 25 years or so. Would be skeptical of a restoration to airworthy on an aircraft that was subjected to the elements for an extended period of time. Not saying it isn't possible, it just ain't really worth the trouble, unless the aircraft has some historical significance. I was taught the number one enemy of aircraft is **corrosion.** My guess is that every single fuselage panel, every single spar, every fastener, every cable, every bit of metal on that plane, needs complete disassembly and intensive scrutiny/attention to small details.