the V boats were i think very unique ,the Narwhal was 381" long, 2 6'deck guns ,3 20mm aa guns, raised deck with 4 deck torp tubes, carried life boats in the deck . once you look closely the norwhal (N1) (ss167)you will see its unique . i first did a simple sail and found that i had misinterprated the levels in the sail and it was more complicated then i thought