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I have included Ships for the purpose of helping pieces crossing the water. I'm also thinking about bridges, or giving the power to one of the Hybrid Creatures to cross pieces to the desired place. 

Remember that Ship is the name of a familiar, recognized piece ([F?vR]), though you could rename the Ship to Warship and make Carries to call them Transports. Some of the typically large Air creatures could also act as Carriers.

The idea I had about it was to put 2x2 "bridge"areas (differently colored, maybe dark & light grey) at the four points where thee areas meet at the corners.

You also could be sure to include Air pieces with the ability to Swap with friendly pieces, Land to Land or Sea to Sea.