you done a top job on that m8
Looks mint mate.
I have rust very much like yours behind the bumper, except a lot worse on the passenger side, possibly beyond repair
nothings beyind repair dude, ive seen cars that look like swiss cheese being brought back from the death. have a look at this thread about replacement arches and sills. theyre very cheap, its just the welding and respraying that costs the bucks (unless you know how to do it yourself). im thinking of getting mine done properly as the rust is just starting to creep back now.