Kim, the inner and outer rockers create most of the longitudinal strength on the Midget. As you remove the rotten metal which always includes the rockers the body will have a tendency to sag in the middle. If the door opening is not maintained with braces across the opening and you fit and weld in your rockers and A piller patches you may find the door gaps front, back and at the rockers are impossible to get right. In my restoration I had to replace inner and outer rockers, inner and outer rear fenders, A piller bottoms and hindges, both door skins, passenger front fender, drivers floor and rear valance. One side done at a time to maintain as much ridigity as I could. Fitted all the metal work to insure good gaps before any welding. Removed any metal that was not structurally intack. Used my floor jack to fine tune the gaps by raising or lowering the frame jacking strut. Rick