I'm in the same boat. I bought a 24' 1959
Tradewind just over a month ago. You totally scored. The airstream's worth more than $300 in scrap aluminum alone, but don't kill it.
Take your time. Set reasonable goals. Organize your restoration in stages, so that you'll stay on track and won't have 90 million open projects at once.
Here's a quick run-down of the expenses I had to shell out so far
new wheels, tires, bearings packed (single axle) - $420
updating trailer hitch with winch-jack and electrical hookups for brakes/lights ~$300
new fresh and black water tank (no grey tank) incl shipping- $400
new water pump for plumbing ~$100
new toilet ~$200
new plumbing lines (PEX) and valves ~$150
new bathroom sink - $60
new bathroom faucet - $25 (Habitat for Humanity rules!)
marmoleum for kitchen and bathroom counter tops ~ $150
I still need a heater, water heater, and fridge to complete the build out, plus a couple deep-cycle batteries and solar panels, which I figure will take another shark-bite out of my earnings.
days ripping out old interior/chiseling away asbestos-tiled floor ~7
days degreasing/bleaching/priming/painting walls ~10
days sanding/staining/sealing wood back to acceptable condition ~10
I spent plenty of other dollars on random items (hinges, mattresses, wood for frames, rented equipment, etc).
I got lucky and didn't have too much structural damage, just a dirty, dirty, dirty-ass trailer with a few leaks that somehow keep moving. She's looking fine now though, and in another month, she'll be heading on her maiden voyage.
Barring major surgery, a focused effort and a strong back might have your Tradewind on the road by the end of summer.
Peace out Earthlings.