Body improvement

[El_Camino]

Hey boys!

Its a thing, disturbing me the whole time, when im improoving the brakes, suspension, steering, which are supposed to be the MOST important on the car.
But every time my car goes to be serviced I hear the same advice: "It is too old, the metal has weakened. Dont push it to the limit!". Of course I cannot NOT push it, but what can be done to a 22 years old body, to resist the crazy driving.
Things I've done so far - rust removal + new painting.

What I mean is something like this in the engine



but also very important at the rear, which is the worst at the moment.
Do u have some ideas, pics...?
Greets!
El