You start messing with the floor,rockers, and problaly front cab mount on a full vert make sure the top is on and bolted tight. Everthing will move around and will be hard to get things line back up. depending on how far you get into it you may need to shore things up.
I just got my new rockers in and that piece of metal for the weather strip u speak of is part of the rocker
cool , if I get that , we can cut out and patch the other metal ! Going to Rhino line it , so its not a show truck