Blast it for $180, replace the things that need replaced. Then go to the dollar store and buy a dozen cans of cooking spray, spray everything heavy (inside and out) and start a fire and let her sweat. Tthen lube everything with your lube of choice, e.g., lard, bacon grease, peanut oil. You will be very happy when you finish. Post some more pics when you finish.
If you have additional time and energy you can add a roof system. Ben added one to our 84 when we ordered and it has helped big time in maintaining compared to our 60. Easy to raise and tows great! We dropped one side and used as a wind break for us and a couple of other teams during the big wind at Dover in 2007