I can definitely believe that. America’s wartime production was incredibly well-standardised and every part was optimised to take as few man-hours as was feasible to produce. German production of everything from rifles to tanks to aircraft still involved a good amount of hand-fitting late into the war by contrast.
I’ve heard that a Tiger II took more manhours to complete than an American heavy bomber.
I can definitely believe that. America’s wartime production was incredibly well-standardised and every part was optimised to take as few man-hours as was feasible to produce. German production of everything from rifles to tanks to aircraft still involved a good amount of hand-fitting late into the war by contrast.