This mockup was made to show the difference between a single-deck and double-deck version of the new Boeing plane that eventually became the 747. It's purpose was to convince former PanAm chairman Juan Trippe that he didn't need a double-deck airplane and that a new category of single-deck plane, which came to be known as the "jumbo jet", would scratch his "ocean liner style" itch.
To give an idea of what the single deck cabin and the double deck cabin would look like, two lumber and plywood mock-ups were built (see picture above for the single deck mock-up). PanAm chairman & his team flew down west to evaluate the options. “Would PanAm agree for the single deck?” It was a tense moment for Joe. After reviewing the mock-ups Trippe told Joe, “You made the right decision”.