Yes, the current Taurus is based off the same platform as the last Taurus, which was a warmed up 500, which is the last generation S80.
Most if nto all of Ford's cars are based off either a Mazda or a Volvo platform.
As for the GT500's thicker floor pannels, I read it in a GT500 press release last year.
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2/20/2013: They Day the ****s Stopped
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