I would agree, but I'm surprised that you say that the drawing was published in 1956. Do you know which book that was?
Hafner says that studies had commenced based on the Vickers Viscount and that this subsequently evolved to become a military freighter; the black and white image shows some similarities to the Viscount and the colour images has rear ramp doors. The internal report on these studies was issued in 1961 after Bristol's helicopter division had merged with Westland and was the subject of a conference paper by Hafner in 1963
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