I made a pattern to transfer the fender-to-door transition edge from the passenger side to the driver side. First, I traced the edge to kraft paper, then cut it out of some cereal box cardboard. I marked the edge on the piece of bed side and cut and rolled the edge with a hammer and dolly. The rolled edge matches to the pattern pretty well.
With the door gap readjusted, I started working on the driver's side fender-door transition using the remaining piece of S10 bed side I purchased for the grille shell. I flattened the top edge with the English wheel and trimmed the edge to clear the A-pillar. I also rolled the edge that parallels the windshield frame with a hammer and dolly.
The fender brace looks good fully welded into the fender. The work with the shrinker-stretcher is visually evident viewed from the end of the hood/bed side. The gap is closed to less than 5 mm after the hood/bed side is re-hung.
The gap between the driver's side fender and the door increased to about one-half inch over the year spent messing with the cowl and the cab floor. I decided to move the mounting points back a quarter inch by pulling the fender edge back, using the remaining edge of the bed side for leverage, and also attaching the top mounting point to the top edge of the hood/bed side. I braced the fender edge using a piece from an extra Blazer front fender. It fit pretty well after massaging it with the shrinker-stretcher.