The Hampton is one of the newest 688 boats. Cincinnati had none of that extra stuff. To make an early 688, leave off the diagonal fairings. In the one picture, you see a pipe on the end of the starboard stern plane, that should be on the port stern plane. The starboard side would be flat. The towed array ran down the starboard side under the fairing, and made an "S" turn in the ballast tank to the port stern plane.
I believe that either the Key West or Pittsburgh were the first 688's with retractable bow planes. The early boats had sail planes. Bow planes work better, but are easily damaged, which is why they retract.