I would definitely save the deck, tires and seat, maybe the front steering components like the spindles if they interchange. The front kingpins are made of cast iron which are supposed to be stronger than stamped steel but cast iron is brittle so I'd think they would be susceptible to breaking if you hit something really hard. But so far I have not cracked any on mine.
I'm really surprised these Husqvarna riding mowers didn't hold up any better than that did. My Sears Craftsman was made by Husqvarna in 2009 and it has held up well compared to my Snapper which literally fell apart by 10 years. Those mowers got cheap as hell around 2000. Stamped steel decks and wheels, etc.
My only complaint is the welds on the deck are weak. They only put one bead on one side of the brackets. It doesn't take much to crack the welds on the deck hangers and wheel brackets. Some of that is probably my fault trying to squeeze a 46" deck through a 48" hole in my yard barn.
Someone mentioned the steering gear wearing out. I noticed mine didn't have any grease on it at all when I got it. Maybe that was one of the 100 point checks that Sears missed when they put the thing together. So I've smeared some wheel bearing grease on it a couple of times. Next time I change the oil I'm going to grease everything on the mower.
After I had a three year old 14 B&S engine on a Snapper 33" rear engine that threw a rod and busted a hole in the engine block. I said I would never buy a mower with a B&S engine on it again. I thought that was just unacceptable for a three year engine to through a rod. Kind of looked like the nuts on the rod bearing vibrated loose from not being torqued properly and no Locktite.
Well my Craftsman came with a 21 hp Intek engine but I got the mower at a discount. The whole mower may have about 300 hours on it by now and when I start the engine after it's been sitting for 2 weeks, it starts up and leaves me in a cloud of glory. I guess the valve seals/guides may be worn. But I only have to add less than a quart of oil between oil/filter changes every 50 hours so I'm not worried about it.
Also those older Kohler OHV engines 14/15 HP made 15 years old seem to be bullet proof. I don't know about those Courage engines. "Taryl fixes all" on YouTube has a bunch of videos on these engines and they must be a POS.