I'm a bit confused. Do you want a scale model kit, or a full-sized (1 inch = 1 inch) thing? For decades, the standard size kit was 1/25th scale (as were the dealer promotional models given out by new car dealers from the late 1950's into the late 1990's).
The problem may be that nobody knows who owns rights to use of K-F car designs. I helped Mattel Toys work out the Henry J prior to 2004, which resulted in the Hot Wheels "Jaded" dragster and the recently released Matchbox 1952 Henry J Gasser scale model dragster. Supposedly a machine shop bought the rights to the Darrin (which was built as a Willys Motors product) from Chrysler Corporation shortly after Chrysler bought AMC (which may have had rights to the Darrin as one of the Willys/Jeep branded vehicles).
According to Copyright Law, copyrights to vehicles built prior to 1960 expire after 75 years. In the case of the 1951 Kaiser, for example, should expire the end of 2026. There is some confusion on the point and nobody wants to take the matter to court to decide if indeed the extentions to the Copyright Act of 1909 (57 year coverage limit) passed by Congress to push coverage (2 extensions) to 75 years were in fact legal or Ex Post Facto and therefore illegal acts.
I too would like to get 1/25th scale models of Kaiser-Frazer vehicles.