I initially thought of starting from Crazyhorse older version, but had to change my plans (i.e. wrong proportions of both hull and sail, sail misplaced, scaling issues, wrong shapes, etc...). So I diverted to D.P. Oscar-I and moved on from there.
After an accurate cross-checking between multiple sources and pictures of the real boats here's the results: The 949A, Oscar-II SSGNs.