I was just putting away a large dog crate in the attic and noticed it has a nice big, black ABS plastic tray liner that could be used as a body panel. ABS plastic is tough and impact resistant.
Not the cheapest alternative but definitely the easiest. Here are some links...
42" x 28" DOG CRATE KENNEL REPLACEMENT FLOOR PAN TRAY
Petco Dog Crate Replacement Trays
Petco 900 Series Dog Crate Replacement Tray
PetSmart Midwest Crate Replacement Pans
PetSmart Top Paw™ Replacement Pan for Dog Crates
