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I made mine out of 1/4" luan screwed into some wood pieces and metal as needed to jump across the large spans.
I've used masonite for concrete forms to make curves and it holds up OK, but you might not get a bunch of life out of it unless you spread the load out with more screws in a larger area for when it gets wet. The truck frame has enough holes in the lower flange to attach plenty of wood supports. The outside endge is the hard part. I drilled through the pich weld on the car to attach some more wood and then attached the Luan. I can't picture the bottom of the truck cab or bed right now to know if that will work. I always thought that I could do a no drill install of some flanges by screwing two strips of material together on top of each other, but with the car body in between one edge of the strips, leaving the screw to clamp the strips and give you a flange to attach the belly pan.
My profile has pictures of my Century's belly pan in it. It has been installed for quite a while with no issues and has certainly been wet many times.
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