Lots of good advice above so not much to add.
If it was a rental or in a fleet doing commercial work (landscaping, snow removal, etc.) such that the incompetent/abusive operator wasn’t the one also doing the maintenance, I’d consider it if they’d negotiate off the $16,900. You don’t have to replace or repair the hood but you’ll have to replace the side panels if you mow with it (which you said you plan to do) and you’ll have to replace the tail lights if there’s any chance you’ll ever road it. I don’t have a clue on side panel cost but am pretty sure the tail lights are $$$. I would check part prices on at least those items and use that in negotiations with the dealer.
If it was owned by an individual or farm (same incompetent/abuser operator was also in charge of maintenance) it would be a hard pass for me. If ownership history is unknown it would be a hard pass for me. Hours aren’t bad at all if serviced properly, but 50 hour service on these things is very important to long term life, and I’m pretty sure there’s another major service before 681 hours. If those weren’t done and done right, I wouldn’t want it.
Bought a truck in similar shape when I was a teenager because it was all I could afford. Prior owner had been trying to “restore” it for a couple years. It was running, but automatic transmission wouldn’t shift past second gear. I knew enough to know the bands were misadjusted and could see the vacuum advance wasn’t hooked up so I bought it. Took me near 2 years to get the gremlins to stop popping up where the prior owner had been “restoring”. Like when I cranked it one morning almost a year later and no oil pressure. Shut it down and pulled the oil pan after school to access the pump only to find a couple pounds of oily pine needles in the pan blocking the pump pickup.
Maybe that experience is still effecting my opinions. I still think it’s rare for an ignorant, incompetent, or abusive operator to not also be ignorant, incompetent, and abusive in regard to maintenance.
Edit: And IMO that damage doesn’t look like it’s from a one time incident such as a rollover or falling off a trailer. It looks like multiple minor incidents from an abusive or incompetent operator.
