It's been a long time, but there is a little progess on reconstruction. Work has stopped on the A pillar as there is a dirty great Moto Guzzi occupying the end of the workshop where I was doing the fabrication (I don't want stray sparks near it).

However, I am able to start the reconstruction of the inner wing and front of the sill.
I am trying to repair the remains of the original, rather than cut it all out and fabricate new. The reason for this, is to maintain critical dimensions and add strength to parts of the structure before I remove other elements.
Progress so far:
New metal stitched in to replace gaping holes. Flanges on parts of the bulkhead behind the wing had to be replaced beforehand.
Section of outer sill cut away to reveal remains of mid sill membrane (this forward section will be replaced).
New section of outer sill already made, but will not be installed until all other repairs have been carried out on this corner. I made it first while I had something to measure and fit it against.
When it comes to welding the sill, I intend to drill some holes parallel to the join and plug weld an overlapping flange behind which I can plug weld the new section to, then seam weld the join. I hope this makes sense.
'I intend to live forever - so far, so good'