Sunamer,
Besides, 747 used the same tech as 707, only was bigger.
A rather uninformed comment.
If so, this is a good book to start with:
747: Creating the World's First Jumbo Jet and Other Adventures from a Life in Aviation Paperback – May 1, 2007
by Joe Sutter (Author), Jay Spenser (Author)
Joe Sutter was the Engineer in charge of this bet the farm project. Not only will you learn about the 747 and Boeing, you will learn about some other interesting things back in the good old days, do you remember the good old days?
There are plenty of books about the creation and history of the Boeing 747 that counters your assertions.