So let me get this straight: the 747 is being made to transport parts for the 787. Will this plane be used during the entire production run of the 787 to ferry parts or is this just Engineering Development work? Seems like a lot of expense to add to the production of the 787...
perhaps, but not for definite, the external dimentsion could be larger, but the capacity of the fuselage is somewhat independant of this, to an extent anyway!