The first issue that stands out to me would be the board. I've seen three different ideas for this:
1. Hexes. I'm leaning mostly towards this, I think.
2. Square distortion. I really like this idea, which works great for everything EXCEPT passing. I'm mocking up a board like this, though, to try it out.
3. Irregular player positions to make squares fit.
As laid out in Tri-Bowl.
I started a thread on this over at talkbloodbowl.com (you'll have to register to see the thread).