Limits of post-Civil War Italo-Spanish naval cooperation

What is known about Italo-Spanish naval cooperation after the Spanish Civil War, and which of its designs is most interesting?

Sales and short-lived cooperation dominate the account, and no favorite design is named. World of Warships gave most resulting projects more attention than they received in reality.

Cooperation largely involved sales, interrupted by rapid falling-outs. No preferred design is named. The comparison with World of Warships concerns the greater attention the resulting projects received in the game than in reality.