Auto Rust Technicians (ART) near Providence RI is very good on the rust repair and frame/chassis stiffening. They don't do full strip and finish paint, however. I had an E worked on there with good results. I did the strip/paint myself (mostly) afterwards. As a comment, "a little rust" on a previous resto can mean a lot of different things. Until you have the paint and any filler removed, hard to know how much rust there really is. ART will find it and fix it as needed however much there is... though rust repair is not cheap.