Making the entire fortress werebulls sounds pretty awesome, though. The question is how I manage to do this... If I can get one or two dwarves infected, they will turn and fight other dwarves, and either kill them or leave them alive, potentially making those dwarves werebulls... How should I go about doing this, though? I honestly don't care if 90% of the dwarves die in making my fortress a werebull city as long as enough live to make it happen eventually.
I'm not an expert on dwarf fortress though, so I'll need some advice on how to make this work, and if anybody can tell me how, I'll gladly make the save file openly available so the rest of you can experiment.
As far as I know, nobody's yet managed to make a successful weredwarf fortress.
One of the real risks is civil war. When a werebull fights a dwarf, one or the other is likely to grapple-- these grapples will persist after the bull transforms back into a bull. At that point, both dwarves will continue fighting, and one will eventually kill the other. The killer is now both a member and an enemy of your civilization: everybody will try to kill him, and whoever manages to kill him will become the next enemy of your civ. Forever and ever, until all your dwarves are dead. Which is probably not acceptable to you.
So a werefortress has to manage this very carefully. Any enemies of your civ have to be isolated or killed (by water or something, not by dwarves). However, it should be possible to every once in a while get a weredwarf that's not a civ-enemy. These would be your resources to cherish.
It is probably much easier to create a werefortress in a reanimating biome.