I doubt if Yankee Warrior ever had an actual tail gunner's station. Like many B-25C/Ds, she may have had the observer's blister removed and a single gun installed at some point, but I don't think the aft fuselage ever had any major structural mods. When the YAM first got her, the blister was missing, and the tail simply faired over with a flat peice of sheet metal. They made a new blister and installed it a few years ago.
Don't know if this will be of interest, but here's a snapshot of the upper turret of the NMUSAF B-25D (displayed as a Doolittle Raid B.) During a visit to the Museum a decade or so ago I noticed they had removed one of the fuselage windows, so I stuck my camera inside and took a shot (this was before digital, so I didn't know what I had until I got the film developed.)
SN
