That is quite a project, irodri41!!!

On my car, if I fix the pinhole / small hole rust by welding the pinhole closed and / or inserting a small patch, is it ok to fit another piece over the whole section like a strengthening gusset? Or should I just cut out all the rust and weld in sections? I am trying to end up with the strongest work. This area will not be visible later as it is on the bottom / inside the rockers.

Thanks.

Rick