Auto body repair & detailing: rear subframe repair 79 camaro, repairing rust, rear leaf spring

Question
Can you offer some suggestion as to proper method of repairing  rust damage at rear subframe near front shackle of rear leaf spring.  I want to make a local repair if possible, as the rest of the frame sections seem solid.  Are patch pieces available?

Answer
Tmirkov. wow thats a tough one . If you can find a 'junk-downer' car you may be able to cut out the section that you need[get a big piece you will probably  need extra metal]. use a sawzall with a long bi-metal fine tooth blade cut through rocker panel,floor ,rail... . with part out clean off dirt,undercoating.paint. Locate spot welds 5/16"-3/8" use sandpaper to locate them. Measure and mark  cut  lines.Now drill out spot welds on your cars repair area look for solid metal . you are going to take it apart  piece by piece  and rebuild piece by piece welding in pieces as you progress. Not a job  for a beginner ,much overhead welding[M I G ] HTH Bill