No styrene kit ever done unfortunately
Several diecast choices, including the 1/24 Matchbox, Danbury Mint, and I think First Gear did it in 1/25? (I know they did a smaller scale for sure)
Ron @ RMR resin has a 1946 Power Wagon listed as "coming soon" on his site:
http://rmrresin.webs.com/nf125.htm