It was fortunate, as said above, to tackle the right side after the left, because the extent of repairs were more serious, and having gained some experience on one side, allowed it to be used to greater effect here.
The part of the rear wing that had to be cut to allow the sill to be removed and replaced illustrated the extent of the rust in the sill area. As the metal was bent down, much rust flowed out of the hole. Again 'cover sills' had been placed over the original rusting sills and filled over.
The outer sills were removed by drilling out the spot welds or using a hammer and cold chisel. These photos show what can go on inside the sills whilst everything looks fine from the outside. The castle rail, again, had been replaced in areas with sheet metal and was flimsy in comparison to a new item.
Therefore it was decided to replace half of the sidemember with a new strong item. The old part was cut up to strong metal which also allowed enough room for an overlap on the inside to make the joined item as strong as the single original piece.
The replacement sidemember was cut and bent so it would lap the existing sidemember by about 6". It was then trial fitted until a satisfactory alignment was found and then clamped into place. To secure it initially, it was welded with a series of plug welds, but then it was seam welded around all edges to provide a structure as strong (if not stronger) as the original.
With the sills in place, attention could be turned to the inner front wing, which had suffered slightly more rusting than the opposite side and required an area to be replaced. The area was cut out and a new item fabricated from sheet metal, the captive nuts were able to be used from the original item and welded to the new metal before everything was clamped together, carefully shaped with a cross-pein hammer and plug welded and seam welded into place. The repair section for the footwell back was also welded in. A few coats of primer were then applied.