Like the rig/photo above, my Spanish 73 had a rusty side panel (between driver's door and rear wheel well). It was cut out with a replacement fabbed by the shop. In the photos below, you can see where the replacement extends below stock bottom edge. Turned out well, with a nice paint job as well.
7X windshield frames seem to crap out every 10 or 15 years. Lots of threads on MUD around this subject. Photos below of my WS frame. Instead of dicking around with repairs, I bought an OEM frame from Mr. Toyota. Fiberglass replacements are also said to be available.