I have the excellent Schofield panel in hand.
The reinforcing pressing below the fridge vent panel is badly rusted, though not showing on the outside. See image. I assume this reinforcing pressing is just bonded on to the outer panel . May plan is to remove the rusted section and replace with a custom replacement and bond again to the panel? Though it may end up being a patch in the outer skin as well.

The second question is that a small section of the floor will also need replacing, in the image there is a upstanding piece (arrowed). It looks as though it has been bent outward already to accommodate the interior cupboard unit.
I'm guessing it is more on an artefact associated with potentially having a door on the offside, rather a structural member, and so can be partially removed when a section of the floor is replaced?

Thanks
Andy