Man, I don't even own the car and it makes Me sick to my stomach!
Not for nothing but you could try this;
- Get a sheet of 1/16" or 1/8" steel, make a cardboard template for the length of each frame rail on both side of each rail.
- Temporally mount to frame rails to determine the width of the strip required at the bottom.
- grind rails down to bare metal, spray weld primer on them and plug weld the sides on every 6".
- Weld the strip on the bottom.
- Undercoat, seal, paint as required.
Hopefully you can get this fixed at a decent price, quick turn around and still be able to enjoy your car.