Floor pans
You are in Plano Texas right? Not Plano Minnesota or Plano New York?
Unless you have a rare, valuable, one of a kind Cougar there are tons of Cougars available in your area that don't need floor pan replacement. Go get one of those cars, use your current car for parts or sell it to some one for what it's worth. Replacing floor pans is tough work, in your area there are plenty of Cougars in the sub - $2000 range that have perfect sheetmetal. For $2000 it's not worth replacing floor pans.
Call Lin Thurston 817-444-0457, he's in your area and typically has leads on half a dozen Cougars that are for sale.