Have you tried the Playable Russian Subs mod? Also known as the "New Playable Subs & More" mod? It has quite a few additional boats including your Ohio class. Both the SSBN AND SSGN models.
Here is the SSGN version... (using the Los Angeles hull as a basis)
And here is my own modded Seawolf class (using the Narwhal hull as a basis from the 2004 mod version)
