Rick's quite a bit right. The JFK was a "transition" ship, kind of a one off. The stern looks like a Kitty Hawk class, up to about mid-ships, but from there forward, the resemblence is more Nimitz class, especially at the forward end of the angled deck.
Kitty Hawk has a rather square-cut look to the leading end of the angled deck overhang, where Nimitz has a much smoother, more angled end, in fact JFK's is more angled than Nimitz.
So my idea would be to take the stern of a Kitty hawk, and join it to the bow of a Nimitz and you'll have it made.