Finished the naval ship....
A good coat of battleship grey and some faded brown for the decks. I used a black marker pen to add the portholes, and a fine black felt tipped pen to indicate the door hinges/handle.
I used the U-Boat crew in the pictures below, look good enough for the ship too
the ship is generic and loosely based on a German M35 class minesweeper and could be used for any navy of the period.