The inner jamb/brace is just spot-welded to the fender.
It can be removed with a spot weld cutter.
Have the entire inner brace assembly sand blasted clean, same for backside of fender jamb.
Then start making weld repairs.
Some 3/16" - 1/8" drill holes in solid areas going through both panels as index/reference points first - to make re-install alignments quick and easy.
Bad part is it sounds quick and easy, but could actually eat up 3-5 hours per fender by the time they are in finish primer.
It would usually be a shame not to do the same operation to the rear fender braces during the same time. Another hour or two each - depending whats hiding - could be more.
So maybe estimate 8-10 hours minimum to treat both the upper and rear braces on both fenders, plus some refinishing labor/materials on backside areas both fenders.
Then exterior refinishing
Makes a pair of NOS fenders almost sound like a bargain from original first starting point to true finished point - in hindsight.
