So my 2cents having owned a G2 Chubby and G2 Party and used them a lot before I sold them to get drums is..........if the rust is just surface based that you could scrape of vs the metal is aggressively eating away then this could be worth looking at.
I had the firebox door on the inside rust and start to crumble and Backwoods was great and simply sent me the replacement sheet metal, screws, etc.
These pics are mediocre and initial knee jerk reaction is it has been used and abused, but as long as the inside of the cooker isn't crumbling away then it could be worth it if you can get it for less than $500 (if inside of the cooker is crumbling I wouldn't buy it). If the inside doors only are crumbling that can be replaced "slightly easier".
The depth looks like maybe it is a G2. I'd confirm if it is a G2 as a brand new one is $1600 so if in non crumbling shape and you can get for less than $500 would be worth it. I'm with George and based on age offer $300
Check the slam latchets of course.