I done mine a couple of years ago now, my jacking points were all crushed up and because that is were the sun roof drains flow into via the sills it rots the floor pan away + a leaking bulk head grommet did not help,
all I done was scrape off the old bitumen sound deadening using a heat gun and a scraper then cut out the rotten patch and drill out all the spot welds which exposes the bent jacking point, I then hammered the jacking point back into shape from the inside treated the rust and gave it a good coat of weld through paint, cut a patch to fit and welded it back in Job done.

OH I then painted the hole floor with rust-oleum paint and stuck down some more bitumen deadening.

I will see if I still have some picks on the computer and post them up!