These are not my pictures, I'm only uploading them, with permission, because I knew you guys would appreciate it!
The tunnel in the last picture, is the only way to get from the front to the rear while in flight, because this plane flies so high, it needs the cabin to be pressurized for the crew, but has an unpressurized bomb bay. This tunnel bridges the front to the back across the bomb bay area.
The silver "garbage can/R2D2" is the .50caliber machine-gun turret system, which I think may have been the first electronic pointed remote machinegun turret. Four .50's. The gunner would look out of the bubble Plexiglas window, and aim a sort of joystick with a sight on it...at least I think that's how it worked.
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