Re the rusted out jacking point- I've noticed something when testing for leaks on my hood. Water can get in between the rubber gasket/body at the base of the hood (it just pulls up and way from the body).
When I poured water around there some goes into the drain boxes just inside of the car but plenty was pouring out of the jacking pad - this got me thinking that's it's not just muck going up but the water coming in from the top of the wings/base of hood and then wetting the jack pad area constantly.
Not sure if it's meant toe work like that by design.