There was one based at my local Aero Club for a short time, about 20 years ago. Also, the design and colours look very 'SAAB like', reminds me of the old SAAB rally cars, back in the late 1960s, early 1970s !!
I'll post something later tonight.
I have a problem on this one. I checked out on this and It turned out to be an widley used turred on many other bomber. so I send you a picture of a nother turret here. Oh yes sorry not a B26.