As this is a kinda Fake project thread...
I gave in... I actually started on the sills today. Mot is T-10 days, next 12-car is T-9 days. She is pretty much required for the 12car, though me and Rich (my housemate/nav) have done enough to win the Uni championship this year I've 3 points less than Rich (Fake getting 5 wins so far out of 6 entries, the last one I got a bit ambitious with a white road in the snow

), and if I hadn't done the sills I was intending on taking all the pretty bits off and giving her a good send off. Sense has prevailed!
Pictures
Doesn't look took bad apart from the scab
However, underneath, we can see when it's split
So, cut an inspection hatch where the rear quarter panel overlaps the sill. I really wasn't expecting to see metal here.
It is rusting out the rear arch from inside the sill, as shown here
But the bellows is still intact

It's just the rear skin thats gone, from the floorpan done to the very bottom of the sill seam
So, to make some room to cut out the rear skin, the leaf was removed, as was the exhaust (note the quite frankly silly angle the jacking point is at, that is supposed to be straight!)
Neaten up the end, cutting out the rubbish. Note the bellows still intact apart from nearest 1/2", and the bottom of the rear skin not being there
So, not as bad as I thought!