For the rotted crossmembers, look for the underbody repair kit. They have become a little rarer these days, so some dealers have broken the kits up and just sell you the sections you need.
The closed channels of the Mutt were a chronic rust magnet.
Floors are easy. Cut out the effected areas and replace with new metal. One of those little Mig welders will suffice once properly set up.
After any repairs, be sure and undercoat everything. The seams and overlaps are areas where more rust will develop.
Ten days before re-inspection. You had better get busy.
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