A couple of good china precision machining service factory pictures I found:
Steven F. Udvar-Hazy Center: Photomontage of Overview of the south hangar, including B-29 “Enola Gay” and Concorde
Image by Chris Devers
Steven F. Udvar-Hazy Center: View of south hangar, including B-29 Superfortress “Enola Gay”, a glimpse of the Air France Concorde, and many other individuals
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 World War II and the initial bomber to property its crew in pressurized compartments. Even though made to fight in the European theater, the B-29 discovered its niche on the other side of the globe. In the Pacific, B-29s delivered a variety of aerial weapons: traditional bombs, incendiary bombs, mines, and two nuclear weapons.
On August six, 1945, this Martin-constructed B-29-45-MO dropped the initial atomic weapon used in combat on Hiroshima, Japan. 3 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 climate reconnaissance aircraft that day. A third B-29, The Wonderful Artiste, flew as an observation aircraft on both missions.
Transferred from the United States Air Force.
Manufacturer:
Boeing Aircraft Co.
Martin Co., Omaha, Nebr.
Date:
1945
Country of Origin:
United States of America
Dimensions:
All round: 900 x 3020cm, 32580kg, 4300cm (29ft six 5/16in. x 99ft 1in., 71825.9lb., 141ft 15/16in.)
Supplies:
Polished all round aluminum finish
Physical Description:
Four-engine heavy bomber with semi-monoqoque fuselage and higher-aspect ratio wings. Polished aluminum finish overall, regular late-Planet War II Army Air Forces insignia on wings and aft fuselage and serial quantity on vertical fin 509th Composite Group markings painted in black "Enola Gay" in black, block letters on reduce left nose.