It didn't take very long to put all of the clean metal back in.
After the fresh metal was put back in the area was primed and painted flat black. Not sure how well the paint will hold up over time, but I figured it would ad a little extra rust protection.
Before I was able to put the outer cowl panel back on I needed to do a little repairing. The first thing that needed repairing was welding up the flap that someone had made so they could do metal repair by covering up rust with fiberglass.
I also noticed it had a few pinholes poking out behind where the A/C box normally resides. When I looked at the underside of the cowl I noticed that those pinholes were just the tip of the rusty iceburg. There was a whole area that was very pitted and weak.So I marked the area out and cut it out with the plasma cutter.
I used the cut out piece as a template and made a new piece out of flat steel. After a few welds the outer cowl was ready to be put back on.