Bought another one off craigslist yesterday and spent the day restoring it. Just used the method that the guy at the Kirby shop showed me. Just some 000 steel wool, mothers aluminum polish and a microfiber cloth. Still needs a new light bulb and an O ring between the metal part under the bag and the exhaust on the fan housing (shoots the dust right out the front as it is now) but other than that it seems to be in really good shape and has had very little use. Got it for 50 bucks with just about if not every accessory that Kirby made for it back then. Even had an unopened bottle of carpet shampoo in the box with the carpet shampooer attachment. Main reason I bought it was it came with an attachment called the Handi Butler which you attached to the front of the vacuum and it allowed you to use some power tools (drill, buffing, grinding and sanding wheels, and even a jig saw). Guy at the Kirby shop told me he sharpens lawnmower blades with one but the belts are really hard to find so I don't know if I'll use it.
Anyway here are a couple pictures. Think it turned out pretty good for just a day of work.
Before and AfterBoth vacuums