So once the outer sill skin is removed (takes a while !), this is what you'll see:
OS Inner Membrane..jpg
A close up of the front internal jacking bracket and surrounding steel (the front pillar is 4 skins thick):
Front OS Inner Mount..jpg
And the rear jacking mount - the one that normally rusts:
Rear OS Inner Mount..jpg
And an image to show the rear foam diaphragm - it's just ahead of the mount, so be careful welding ! :
Rear Mount and Foam..jpg