I managed to get a bit more work done today, managed to weld on that inner corner,
make and weld on the right hand side corner inner closing section, not going all the way around as the rear closing panel will close of the corner(if that makes sense, it does in my head!)
cut the rest of the rear valance off and clean the edges up, each end of the rear closing panel has gone so will be needed to be made up, did think about getting a new rear closing panel, but they cost about £40 and would still need to mod it as there's only none genuine ones out there.
weld the left hand outer corner on
and finally finish by treating the inside of the rear valance, with a good coating of rust treatment, cling film and leave to do its job.
Just need to clean all them welds up, it's good to see some progress,