Ya know, Bryce, if you replace the tank, and everything that is rubber and or plastic, you might have something there. But man, that's a lot of work. I gotta hand it to you for undertaking such an endeavor.
It drives me crazy when people neglect/destroy what was once a really nice motorcycle. If the PO has hosed that thing down with a couple of cans of Honda polish, tossed a sheet over it, dumped a bunch of Sta-Bil in the tank. and bought a bucket of rat poison when he parked it, it would have taken less than 2 hours to get it cleaned up, and running.
I'm a firm believer that motorcycles belong in the house.