A few nice precision engineering china photos I located:
Steven F. Udvar-Hazy Center: B-29 Superfortress “Enola Gay” panorama
Image by Chris Devers
Quoting Smithsonian National Air and Space Museum | Boeing B-29 Superfortress "Enola Gay":
Boeing’s B-29 Superfortress was the most sophisticated propeller-driven bomber of Globe War II and the first bomber to residence its crew in pressurized compartments. Although created to fight in the European theater, the B-29 found its niche on the other side of the globe. In the Pacific, B-29s delivered a range of aerial weapons: traditional bombs, incendiary bombs, mines, and two nuclear weapons.
On August six, 1945, this Martin-built B-29-45-MO dropped the initial atomic weapon used in combat on Hiroshima, Japan. Three days later, Bockscar (on display at the U.S. Air Force Museum close to Dayton, Ohio) dropped a second atomic bomb on Nagasaki, Japan. Enola Gay flew as the advance weather reconnaissance aircraft that day. A third B-29, The Excellent Artiste, flew as an observation aircraft on both missions.
Transferred from the United States Air Force.
Country of Origin:
United States of America
All round: 900 x 3020cm, 32580kg, 4300cm (29ft six five/16in. x 99ft 1in., 71825.9lb., 141ft 15/16in.)
Polished overall aluminum finish
Four-engine heavy bomber with semi-monoqoque fuselage and higher-aspect ratio wings. Polished aluminum finish all round, standard late-Planet War II Army Air Forces insignia on wings and aft fuselage and serial number on vertical fin 509th Composite Group markings painted in black "Enola Gay" in black, block letters on reduced left nose.