Consider this. The assembly line worker doing that same job 8 hours a day, 5 days a week (or more on OT) was bored. The location of the actual stripes were not a precision task. I would assume that the shafts were positioned horizontally on a table like fixture and rolled to get the paint colors, width and locations of the stripes from another fixture. The worker was not an artist. In other words, location accuracy was not critical. Colors and position were.
The actual colors are the main concern. As Ford was known to be a frugal corporation, it's quite possible that the paint used was exterior or interior "dregs" from the bottom of a 55 gallon drum of a required color close in tint.
Just some thoughts.
Over the years, I've know many former Milpitas Assembly Plant workers and they had some "interesting" stories.
Jim