While taking some measurements on the frame of my '40 Coupe, I noticed that the side rails have a downward bow in the section between the front & rear kick-ups. This area looks straight and parallel to the ground to the naked eye, but now I'm wondering if my frame is sagged. The doors fit fine, with even gaps before I began a body-off rebuild. Wescott's drawing "appears" straight in this area. What's your experience been?