Hee hee,
This is fun, what is standard?
I've flown 75+ different 747 airframes as freighters, and really, no two are the same.
Best visually were the old PanAm birds with the Juan Trippe artwork on the back wall.
Worst were the converted U-boats.
Best over all were the -400s built for the job.
And even line number 3, still flying at Evergreen, was a joy to fly. Didn't matter that it had done the hard landing test flight series.