I never said they fit, but they look beautiful, and after you spend some time making them fit precisely you will be much happier with the results.
I say for myself, having the tools I have, the experience I have, it's possible to reproduce these parts, but in doing so, this project would be finished at first in 2025, if at all, lack of motivation comes largely from the overwhelming feeling of the big job ahead, taking short cuts so to say, by using readymade panels is the way to go in my mind...
I haven't used g body panel parts before, so maybe i'm speaking out my rear, however it has been my experience with other projects that stamped panels only require minimal amount of work to fit properly.