Yeah it's more than surface rust look on the inside where the firebox attaches right above the grate, above that is rot. It also doesn't look like thick steel to me.
Look at the weld in the second to last picture, it's kinda thick. Its definitely not that stamped garbage. I think that rust will come off with the wire wheel on the drill. I had a decent offset a long time ago and I've been wanting one again since I became a member here, and seen all the real deal Q here. But alas I'm a cheap basterd and don't feel like spending more than a hundred bucks. There is plenty of those BS stamped Char-Broils in the $50-$100 buck range (some in brand new condition) But I would rather get an older thick welded one and fix it up I'm thinkin'
Also lookin' at this contraption to just throw on my Weber, But I don't like that you have to take it apart to access the fire.
DAMMIT! I'm gonna get a real smoker before the summer is over!...just not sure what i'm gettin' yet i guess?