R aand C I think most of the rust is going to be cut away. And with a blower and lots of power u wont be driving it in winter or leaving it parked in the rain. Your rocker panels {below the doors} look good and thats a primary frame attachment point. Once u set that body skin over a pro frame you ll have to make all new floor pans anyhow. On the top grind the rust and fill with Dura Glas.