As I understand...
The "Moby Dick" ride was just a concept idea that never went farther than these drawings. Bushman started the concept work for Kings Island around early 1969 - and he based a lot of his concept work off of HB properties at the time. He was also doing concept work for other potential "Hanna Barbera" stand-alone parks as well. FYI, I believe Bushman was hired by Taft - not Coney Island persay - so his work *might* have started well before the Coney merger.
"Moby Dick and Mighty Mightor" was a very short lived cartoon made by HB in 1967. It was not popular at all. I don't know of any other "work" done using this theme other than these drawings. I do seem to recall the original EV having a "nod" to Moby on the side of building - a large "flat" of the character that went along with all the others on the building.
There was a lot of other HB stuff that never left the drawing board. Ironically, at the time, Scooby Doo was a new fledgling property for HB - so it was used semi-sparingly in the theming (other than things like the coaster name and Shaggy and Scooby figures in EV.) Ironically, it became HB's most noteworthy title and that's apparent in the number of rides that eventually got added to the area and themed to SD.
FYI - when Paramount "re-did" Hanna Barbera Land, the new entry sign to the area was meant as a "nod" to the early Bushman concept.
I believe a Hanna-Barbera park was eventually opened by KECO in Texas in the early 1980's. It did not use the Bushman concepts, and only lasted around 4 or 5 seasons. It used a lot of the same "elements" that were included in the KI 1982 HB Land remodel as well as the themed area at Canada's Wonderland.
Frankly, out of all the parks that I visited that had a HB themed area (I went to KI, KD, Carowinds and Wonderland) - Wonderland probably made the best use of the overall HB theme and I felt it was closer to what Bushman had in mind.
But remember - Bushman was used to conceptualizing Disney attractions - and used to having deep pockets and vast resources to dive into. Wheras Coney and Taft, were not as "unlimited" when it came to budgetary constraints.