I wonder if a small motorcycle cover wouldn't work slick over the hood and steering console??
You'll probably get lots of opinions on the whole covering thing, but here's mine.
The way I see it, the only typical environmental harm to a tractor is UV radiation. So if the tractor has any kind of roof over its head, I would be reluctant to use any additional form fitting cover. There might be some dust or abrasive in the cover that would cause the scratches you're trying to prevent. And there is also the risk that the cover will trap condensation that will promote rust.
BTW. You're the only nut. The rest of us pride ourselves on making the utmost rational decisions regarding our tractors and implements.
Just don't ask my wife.