Carbon fiber floor pans would be suicidal in an accident -- they would explode into dust and minute particles. A carbon fiber and kevlar would be somewhat safer.
If you have ever seen a race crash and jagged body parts are hanging on by threads, that's the kevlar portion. The cloud of dust at impact is the carbon fiber.
I'm certainly not a spokesperson for Carbon Joe, but I do remember him saying he would not do c/f bumpers due to liability issues. If that's still the case, he would be running a greater risk with floor pans.
Additionally, while one would save significant weight, it would be low weight. The car would actually be more top-heavy -- unless one was also planning to make a complete c/f shell.
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