The difference in technology likely plays a large role - these parts were designed without CAD and modern fabrication protocols have changed.
It reminded me of NASA's endeavor to reverse engineer the Saturn rockets
https://arstechnica.com/science/2013/04/how-nasa-brought-the...
Actually, the B-2 was one of the first military aircraft designed with CAD.
https://www.northropgrumman.com/wp-content/uploads/B-2-Spiri...
(search for "NCAD")
Actually, the B-2 was one of the first military aircraft designed with CAD.
https://www.northropgrumman.com/wp-content/uploads/B-2-Spiri...
(search for "NCAD")