I joined Autopuzzles.com as I was following the tracks of the "Dan LaLee streamliner". Since Grobmotorix found this identification, confirmed by different leads, I have always felt that this puzzle should be declared solved. All that was maybe missing was the source of this identification, which Grobmotorix said he was unable to track again.
I found it, I think. It's not on "The Making of Modern Michigan", as he thought, but on a related site:
Grobmotorix pictures come from The Detroit News, dated 2-10-1938. Dan LaLee is mentioned in the description. So, a Michigan newspaper, and nothing says that the pictures haven't been taken on the Packard proving grounds, like Motorace thinks, but it can as well be on a California airfield (which would look just the same), since LaLee was a "California airman". Those from Popular Mechanics" are California photographs.
I believe this is enough to recognize LaLee's fatherhood of this car and I wrote to Tuckeroo and asked if he could declare this one solved.
And, by the way, could an admin move this topic to the Solved section?