BMW Isettas built under license in Brazil: https://miscelaneadoorejana.blogspot.de/2013/09/o-isetta-brasileiro-montadora-pioneira.html A Mexican Beetle plant:
You might notice the updated sheet metal stamping on the assembly line photo in question. There is no indentation for the older hood latch mechanism, as well as other minor differences which confirms your suspicions that that was a post-war image: Two years earlier, it still was a sinister prototype:
A lamp-rubber, eh? Here, knock yourself out: Looks like a raffled bug, sponsored by the "Strength through Joy" (Kraft durch Freude) program of the National Socialist government:
GM-Mexico: http://www.gm.com.mx/corporativo/gm_mexico/historia/ Stovebolt assembly 1951: Supposedly, half of the following were exported to the U.S.. I haven't yet seen one, there:
If they were, I hadn't seen any around, but they may just have been rattletraps that fell apart after only a short while.
They were pretty good and were based on the Renault 12 chassis. If anything, they would have rusted out quickly, like the Dauphines did. I think, the author just got it mixed up, otherwise, there would be some still left, in California
I grew up right down the road from the Delaware Boxwood GM Plant. Loved the school class field trips to see how the cars were put together. Always liked that they put a body (dont think they had engines/trans) of what ever they were building on top of the corner GM sign. No more GM in Delaware, I believe that they have finally sold the empty plant last year.