Even before all the sheet metal started getting stamped out overseas by teenaged slave laborers, the body man's friend was an oversized hole and a "fender washer". Fortunately, it's impossible to see both sides of the vehicle at the same time, so short of doing major reconstruction of the panels, "If it looks good, it is good". Body work has never been an exact science, but now with the poor quality parts seem to be the rule, rather than the exception. Just do the best you can- - - -which is a sad commentary on the stare of the repop sheet metal that's available these days.
Jerry