An update: got all the rotten rocker panel off, both inner and outer, on both sides today, via the injudicious application of an angle grinder and my Dead On Annihilator (the greatest tool ever made, and useful for both destruction and killing zombies.
http://owl.li/68ub8 )
My brother-in-law sorted me out with about 20' of 2x4 3/16"-walled steel tubing and a MIG welder. I'm going to have to fashion a couple reinforcement brackets, but it _looks_ like they'll slip right in. At which point I'll discover the entire Eagle has twisted out of true, no doubt.
More pics and amusing anecdotes as they occur.