Update:
Welded up the front framerails where they were hacked up years ago in a failed oversized radiator install attempt.
Installed the new front door pillar:
Fitting the front floor pan:
I think swiss cheese has more structural integrity than the rear corner of the cab. Time to start cutting.
Old rear door pillar out:
New rear door pillar in:
Front floor pan is zip screwed and bolted in place for now. I'll start mating up the new rear floor pan next. Once they're both fit correctly, I can fit the new cab supports, then weld it all up. Then it's on to the kickpanel, rocker panel, cab support rail, lower firewall, and cab corner. No big deal. Haha.