No, that is a real DC-8 First Class cabin. If you put the aisle in perspective with the flight attendant, it is only about 8 inches on either side of her ... and, flight attendants were narrower in those days
One thing to notice, other than the cool Palomar seats, (boy, THAT
brings back memories), is look at the wall between First Class and Economy. Quite a change from today's curtains, or even worse, on American carriers ... nothing!
Just because I stopped arguing, doesn't mean I think you are right. It just means I gave up!