I like the reference, but Fight Club is not supposed to be a story to take inspiration from completely, it is more of a cautionary tale - which is what the author of the novel intended I think. Having said that it does make some good criticisms of society such as consumerism and conformity, and those are definitely some of the positive aspects of the story which everyone could take a note from. Anyhow...
The army that they had near the end of the movie/book went against what the protagonist originally wanted. Fight Club was founded with the idea of rebelling against society and its expectations; a group of disenfranchised young men who wanted to shake up the collective - there was an element of individualism. The problem, though, is that by the time Fight Club had grew into Project Mayhem, which was the next phase, those men started to become more and more sheepish. All of them had shaved heads, all of them wore the same clothing, and they all referred to Tyler Durden as "sir". Yes they became an army, but being an army dehumanized them, and they no longer had a sense of individuality. This was what Fight Club was supposed to destroy. The more they rebelled against the norms of society the more they turned to conformity. It is a case of: "I am different just like everyone else."
Apologies if this is derailing the topic.