I've started calling around looking for someone who can repair my floorpans (if I don't do it myself). The 1st guy I talked to said that I might consider using fiberglass for the repairs. It would be much easier to maintain the existing shape of the floor. Most of the floor is pretty solid considering I've been hitting it with a small sledge to remove the tar. Here's a few pics.
Driver's front...
Driver's back...
Passenger front...
Passenger back...
Cat hump area...