I will be using 3/4 square tubing across from one side to the other so the floor is flush with the door sill. That will give me at least 4 inches of space below the floor to route the air through. The inner fenders I will probably make out of plastic. The belly pan floor will be made out of coroplast and if I am lucky the entire bottom of the car will be totally flat.
I have a 4x8 sheet of 22ga metal ordered but if it doesn't come in by next weekend I will just go round up a bunch of old washers and dryers and cut the panels off them to use for the floor. It is going to be totally flat so that makes it pretty easy to build. The trunk floor is going to be pretty high though so there won't be much room in the back to haul junk.
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