WOW 12 boats, 89 million usd! thats 1,000,000 dollars per foot, is that really cost efficiency?
Obviously, you are not familiar with the existing Mk VI boats...
Now in production. Planning up to 48 of them. Fit in well decks of the amphibs. Able to launch and recover drones. Can carry SEALS and EOD (mine disposal.) Can be fitted with Griffin antiship missiles, though not currently standard armament. Aluminium, with diesels and pump jets.