What gets me is how lightweight mechs in garages give it the 'thats really a lot of work fixing that' when in actual fact it's not, there's maybe 2 days work MAX doing both sills there, your problem is garage rates, back street garages have all but been eliminated so any quick fix welding places just dont exist any more, last one i did was my exes mum's fezza where 8 inches of wheel arch had vanished, along with part of the inner arch, MOT guy couldnt tell where it had been repaired apart from fresh paint.......
My cat can rot all it likes, it'll get fixed.......