bit of progress to report, pushed the car to one side of the garage so that I had a bit of space to work and set about repairing the rot. I should have known better after the last shell what lurks inside a seemingly small hole in an e30 sill, needless to say after half an hour with a grinder I was left with bit of a gap to fill and a strong feeling of de-ja-vu! Note to anyone looking for an e30, this looked absolutely fine from the outside and underneath and even had the 'jacking pad' fully intact, only with e carpet removed and a screwdriver would you find horrors like these
Here's the hole with the first section of floor grafted in, sorry but in my frustartion i didnt get any photos of the 'before' part.

Same again, make up a plate, hit it with a hammer a few times and stick it in

Inside shot

Lip welded on the bottom

90 percent of the outer sill was saveable after a good cleanup

The other 10 percent had to be made up

Stitched in and plugged along the bottom seam

Trimmed and linished

Now on to the scuttle.... take a grinder, cut the brown death out, make a plate, tack it in and curse continually for 3 hours about how the metal appears to resemble cardboard in that area and how BMW have deposited half their stck of sealer in the corner....

Got there in the end

Now that the rot is out of the way on the left hand side, I can tackle the rot on the right hand side, luckily that is solid in the floor area apart from the scuttle. I will also remove the jacking pad for piece of mind on the other side. But before that I need to fit the sill stand holes.