Wow! Looks like you're already thru a lot of the rust repair. That'll be a nice Duster when you're done. Your rockers don't look as bad as mine were, so like you said in your thread, it might be better to just section in that back piece from a doner car. The rest of the rocker looks good from the inside down where those drains are? Mine wasn't thru where the inner was spot welded to the outer along that bottom seam, but it was paper thin in spots and would have rusted thru in no time. If yours is still good and showing little rust I'd pump some evaporust thru there for a few days and it'll make that pinch weld seam spotless.