Custom Kirby?
That metal will definitely polish up nicely. You can start with some Bar Keeper's Friend on a damp (but not sopping wet) sponge to remove the oxidation, then polish it with Mother's. When you're done, give it a coat of car wax to retard further oxidation. You'll be surprised at what a difference it will make. I just did this to my G5 and it looks like a whole different machine.
It's a shame the vacuum isn't more original; It kind of reminds me of that old joke about the family axe that's been in the family for 150 years and it's only had four new handles and two new heads. But it does give you an interesting opportunity, if you want to take it, to create a customized Kirby that's uniquely yours. Of course, the flip side of the coin is you could find another Dual Sanitronic that needs some work and use this one as a parts donor. Whatever you decide, keep us updated. We'll be interested to see what you come up with.