That's an interesting concept, but only a queen and rook can get across easily. Pawns impossible, and other pieces only with trouble (wasting moves while your other pieces get attacked).
But I do like board with interesting shapes. The board (below) is from LEBisho. I think it was a great idea, and the game had a good start, but then LEBisho just disappeared, adding to the mystery.
2 or 4 player game.
Two chess battles are fought, but players can move pieces from one battle to the next one via the corridors in the middle.
Opinions please
http://www.chessvariants.com/shape.dir/mastertriple.html