Right side sill
I was quite right about the other sill being severely attacked by tin worms.
However only the bottom 2 centimeters of the sill was rotted out.
Unfortunately both the inner and outer sill was bad so I had to weld in the lower lip of the inner sill first.
It is not very comfortable to lay on your side to cut, grind and weld upwards with very little room between the car and the floor. Should have had a hoist to lift the entire car one and a half meters up :frown
Had a look inside the sill and it looked fine, could still see the yellow rust preventive stuff inside.
Put on some weld through primer and tacked the first part of the outer sill on.
What remains is the part going from here all the way to the rear wheelhouse.
Probably need to make two pieces to fix that.