Need advice on floor pan/rain channel repair

[62 Barnfind]

I am getting ready to repair the rain channel and the floor pans on the 58 (From Orange to ?) i'm working on. Anybody have any advice on the removal of the floors for the replacement panels? I am also repairing the rust on the rain channels above the doors. The metal is really bad above and below the channels. Any advice will be great! I think I have the right way to go but it would be nice to get advice from someone who already did it.