Looking down the inside of the starboard wing, between the leading edge and the front wing spar. While I wasn't allowed in, it was easy to see that I would have no problem standing up between the ribs in the 13' thick wing. It was designed to be able to access and perform minor maintenance on all 8 engines during flight. The tank on the left is a 300 gal. fuel feeder tank for the engines on this wing. This tank is filled from the main tanks below the cargo floor. There are no main fuel tanks in the wings. Note also the engine supports for all 4 starboard engines.