doesn't hafta be a jewel, but you'll still need to find cross sills to mount the body, and the original floor of a TF panel/burb is plywood, surely easier to work than a makeshift metal replacement
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics