I am glad this topic came up again. I have learned/confirmed a lot more information regarding all plastic Hot Wheels, although there are still a few questions. LOL

There is definitely an all plastic '57 Chevy and it has showed up at least twice. Once in the 5-pack and once as an FX Color Changer.

The contemporary all plastic Ferrari, Race Bait 308 does not exist.

The Phastasm is all plastic and has showed up twice, once in clear as a Halloween chase at Walmart and in green in a Halloween 5 pack at Target.

There were a couple of others in the Color FX series, although I may be mixed up with some of the names. I have the Big Bertha and there have been reports of the Hummer and the Command Tank. A couple of guys at HWC are supposed to be checking for the Hummer and Command Tank. Both of these are possible because the tooling appears to exist.

Guys are still reporting the all plastic Escalade Taxi, but it still hasn't been confirmed. The chassis are easily identifiable by the placement of graphics and so far every plastic bodied car has had the black painted metal one.