I think it's best to put a few story concepts out, and then let the teams vote on which story is best. But let me just say, in this mod, we should see the Breen through their eyes, not the normal Federation perspective. And from that, we can conclude the Breen do not see themselves as evil. Just like the Russians see themselves in a positive perspective, yet Americans see them as "bad guys".
While the only things that are canon are things seen on the TV or Movie screen, any books written under the eye of Paramount, Viacom, CBS should be viewed as "Authorized" material (That's a concept that all "Trekkies" need to accept, in my view. As with any other show... like Star Wars or Harry Potter. Books that are given the seal of approval by the Authors or owners of any said franchise are just as valid, if not more valid than what is seen on TV). Also, we are doing Fan-fic here. We should allow ourselves our own creativity
I think the Breen would not be too friendly to the Cardassians or the Federation nor any of their allies.
Styer, I love the model.