The gbnclient does not allow you to group your fleet
all together.
I have seen that much of the code relies on water
seperating ships to know what size ship is being hit or
if a ship is sunk. The user interface for placing boats
would also need to change to accomodate placing
specific types of boats.
Sometimes with a popular board game similar to this
game it was fun to stack a 2 and a 3 to keep people
guessing if they had sunk your 5 or not.