How do I get to the sea cells? Are some of the sea cells starting positions as well? Do I need to go through the targets? And for this to be like the game, shouldn't the targets be able to attack ship cells on the OTHER side of the map (ship cells one way attack targets on their side of the map, which can bombard all ship cells on opposite side of map). I think the only attack option across the map should be bombard, just like in the game. I take control of the target on my side of the map, and bombard ship cells on the other side (which then can't be taken back, like your latest suggestion suggest). Also, if you plan on having any sort of decay or killer neutral on the targets, that needs to be mentioned in the legend.
Regardless, this is pretty close to the stamp, so I will go ahead and sticky it.