Heck damage, bulging or swapping parts?

SLK 200 R170 with rear damage. The plastic bumper has completely restored itself due to the processing but the sheet metal behind and the trunk frames as well as the luggage shell are inflected. Would it theoretically be possible if I dented everything with a rubber hammer or something? How would a reperature fail? I don’t find the right part at 7zap etc., otherwise I would pick it up from the butcher and replace it, knows there more? The trunk also does not go to because the lock nac h is bent inside. Thus the roof does not open either. To go it was easy. On the picture below, it had to be the part with the number 50 and the part on the left without a number.