Examining the woodwork I found lots of rot - see 2 pics below, one where a previous owner had cut some wood in as a patch.
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I thought I would start where I had found a hole in the o/s inner rear wing - as I raked out the rust the hole got bigger until eventually I had to remove the whole of the inner wing - the flange which joins to the woodwork had rusted through and had separated so there must have been very little structural strength to the car. Next 2 pics show the state of the wing.
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The pic below shows the chassis mid section with evidence of brazing and several layers of metal. The floor the other side of the chassis was also holed by rust in a strip all the way down to the strengthening box section at the rear of the floors.
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More to follow ....