Went at floor with angle grinder .. there was a large "L" shaped rust hole where they fitted a steel box under the floorpan to transport the shell ion the production line. This is a known detritus trap and slowly rusts away

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Then added in some new metal

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Had to do this on both sides but rather than chop out the whole floor section I just cut out the depressions and a small edge and welded it in. On the passenger side the rust had also started a bit further back too leaving lots of pin holes, so that has also been sorted. You can probably see the new patch in the first picture .. it's actually a corner from the driver's side floor that was in better condition and had already been cut out and replaced with new metal. Waste not, want not!
Have now started to grind off several layers of primer and paint from front panel and front wings but it is not kind to the discs ..

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(or probably the environment

.. 'Elf & Safety means I wear a good multi-filter mask and snug fitting goggles to keep ME safe!

)
May need more than the five purple coloured discs for my 100mm diam grinder I've already bought as I still have to do from B-posts back and boot lid. Luckily bonnet is replacement and primered.
There is a lot of rusty metal in the front panel where the wings bolt to down the front. Sills need to be completely replaced and I know there is more rust to be cut-out in the shaped rear 3/4s.