Spring styles book says it is the third of four redesigns for the Lexington. Here is the link:
http://www.history.navy.mil/photos/imag ... 84148c.htm
According to Wikipedia, the Lexington was to be over 40,000 tons standard, while that design is 35,500 tons.
The third redesign was smaller, only 850 feet long, mine, which is the second redesign called B2 is 874 feet long, and is slightly wider.
What you linked me is not the truly "definitive" Lexington.