I have made several conversions by taking the basic hull from a Hasagawa, or now, the nice DML kit and scratchbuilding the outer hull, flightdeck, bow, and island. I used the "Detail in Scale" series, plus cruisebooks and photos that I have taken or collected of the actual ship that I have converted, in my case, I have built the Lexington, Yorktown, and Oriskany.
As mentioned, Ray Bean, who hangs out at Steelnavy.com, has done this conversion from the old Hasagawa kit and sells a CD pack of many photos of Essex class ships. Another person who has helped me in my latest Korean war conversion with photos is Tracy White and you can find him at Modelwarships.com. Tracy has been collecting a lot of information on mainly the WW2 Essex class, but has a pretty extensive knowledge of the modernization periods as well.
The Dromadory does have some plans of the Intrepid in SCB 125. But these are pretty incomplete.
I was starting a 1/350 conversion, but am thinking about waiting for the movie to come out, meaning that I am pretty sure that DML or Trumpeter will be poppining out a modern Essex within the next few years.
Scott