I would agree with Bruce, Butt welding in the partial panels, hammer the welds flat, fill with some fiberglass filler, prime and paint and if done right the repair cannot be easily detected. Should only take a weekend to complete. Unless you have major rust issues full panels would be a make work project.

Good luck and let us know how it turns out
Brent B
Oh ya,...and you can buy more beer with the money you save