HarryMann – the pressurisation was a modest 2½ PSI on the Boeing 307, in practice the pressurisation system had problems and was not used. Had the pleasure of seeing a gleaming polished metal 307 sitting on the ramp at Tan Son Nhut Airport in Saigon, Vietnam when I arrived late 1970.
Igh – this will be the photo to which you refer with #3 and #4 shut down. The prototype used the fin/rudder from the B-17C. Following the crash it was redesigned and in fact incorporated onto the B-17E when its tail end was redesigned to incorporate a tail gun turret.
