Well looking underneath the car I see no sign of rust eating through. I can smack on the bottom (or top) of the floor pan in both the rusted area and any non rusted area and the sounds I hear are the same. So I am pretty sure its only on the surface of the pan. The only area I am unsure about is the area under the roll cage mount. I have no way of knowing how bad it is under there.

Maybe I will have to fire up a torch and remove the welds?? Then I should be able to tell for sure....
Has anyone here every replaced a floor pan? Is it very difficult??
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Sonic Blue 2003 Cobra - Autlogic chip, Magnaflow x-pipe, mufflers, 2.9 inch pulley, CAI
Black 1991 GT - 347 twin turbo 6-speed distributorless ignition - nothing stock