This is the place where the majority of the warbird (aircraft that have survived military service) discussions will take place. Specialized forums may be added in the new future
Here are some closeups of the tail gunner's station of 'My Gal Sal.' She's a B-17E, but I don't think the tail gun was changed until the 'Cheyenne Turret' was introduced. Note: the interior is (correctly) bare metal. It only appears green in some spots due to being seen through the armored glass windows.
I don't really have any detail shots of the enclosed, unstaggered waist positions, but here's an interior view of 'Shoo Shoo Shoo Baby' at the USAF Museum. Note: The green paint is incorrect...on production B-17s the area aft of the radio room was almost all bare metal.