My younger brother is building a ‘29 pickup that is very similar to that. He’s a machinist by trade and has commented (several times) on the challenges that this particular project has posed.
The steel stamped panels are notoriously loosey-goosey and have required significantly more tweaking to get aligned, square, and/or symmetric. It’s been driving him nutz!
For instance, the cowl (between the firewall and the windshield) holds the fuel tank on that era truck and once he warped all of the panels so that they were symmetric he couldn’t get the tank installed (it was also out of square). He had to open it up so that he could get the tank in and then warp the panels back into shape.
Several days work on something that most people aren’t likely to notice.