Why don't you finish it like a really big cast iron pan? I'd use a map gas torch, a tub of lard, and a bunch of paper towels. It should be good for a 100 years or so and have the classic deep rich appearance of cast iron and not rust.
Take it outside. Get it good seasoned, then fire it up outside until it stops smoking, while drying the outside with paper towels. Then install it inside and use it.
Not sure how bad it is as far as rust and such, but if you had access or know somewhere to get it sandblasted, I would start there. Then do as said above and either season it like a cast iron fry pan, or paint with black high temp paint. Just kinda depends on what look you want.
I used a wire wheel to clean mine. Then bought some fire proof caulk for all the seams and joints. Then painted it with black bar b que pit spray paint. Looks like new!!
Applying cerakote is not that hard at all. All you really need is a compressor and a cheap sprayer from northern tools or harbor freight. The biggest issue with applying the finish is preparing the surface. You want to be sure it is very clean. Once you spray on the cerakote, it goes on very easily.
I would recommend the higher temp ceramic, I believe that does not have to be "cooked" on. With this you will need to spray it in an enclosed area in a garage or something like that so dust does not drop onto the oven as the cerakote is drying. I used to setup temporary paint booth with plastic tarps.
***Forgot to mention, I always used a painting respirator to not breathe the cerakote in. You can pick up disposable ones pretty cheap as well.
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