One of the reasons the Karmann-Ghia has such a lovely and distinctive look is that, unlike most cars, its body is entirely one piece, save for the parts that open, the doors, hood, and engine lid. There are no issues with panel gaps because there really aren’t any panel gaps.
There’s no separate bolt-on fenders or anything like that. The body of the Karmann-Ghia was laboriously hand-welded and sanded and finished, by skilled craftspeople, not big machines.