Nice job Brian, and another one of those whifs with enough of a foot in reality to fool folks.
TWA actually did have a B-17G (44-85728) converted by Boeing to an executive transport as the Model 299AB.
The aircraft was later given to the Shah of Iran.
The conversion followed the general pattern of the wartime XC-108 and CB-17 conversions.http://www.twaseniorsclub.org/TWAB17/TWAB17.html
The Swedes operated seven converted F and G models, although these only carried 14 passengers rather than 67.
Having flown in a B-17, I have to say I'm not sure where you'd put
67 people, it's not very big inside.