1968 340S Coupe 4spd

there aren't any aftermarket steel fenders so I would section those with good donor patches or aftermarket patches. Everyone does different. One might search the world over for perfect fenders. Another would work damaged areas as much as possible and load with bondo.
To hammer out the nose of a fender I would rather cut into the headlight house as required to work it from the backside. Patching the headlight house doesn't need to be perfect or pretty.
Aftermarket quarter skins don't reach the rain gutter/trunk opening. If that portion is good aftermarket skin is good. If that portion is gone it will need to come from a donor.
It's not the body panels that worry me, it's the foundation that makes the door sound, fit, and feel correct today and for many years to come.