The glass work from the factory around the keel trunk under the liner looked like hell at best. That said, yeah, there is some worse DIY repairs visible in your photos. The scenario that comes to mind that would cause someone to do that is the keel cable let go and the keel swung hard against the trunk. That's bad news typically and a proper repair is more costly than the boat. I'm not saying that's what did happen... but that can happen.
The keel weighs about 550#, was sand cast iron (i think) and the hardware only lasts so long. The pivot pin, cable, and cable terminus are all suspect on boats that haven't been maintained and they are challenging repairs for a DIY because of the weight of the keel. So proceed cautiously.
The next concern I see is the bow detachment. Lots of those boats (mine included) have had the turnbuckle added, usually when a furler is installed to strengthen the front end and once completed I've never heard of an issue. But it sounds like this one was added after it separated so who knows what other damage resulted.
If you wanted a project boat, you sure found one. Less than a grand or walk away.