[@Double Capybara] Not for lack of me trying, but I don't think Wikia is capable of making wikis private. If you're worried about it, we can tear down the wikia wiki and make a new one elsewhere before we all go crazy adding pages.

Edit: I'm going to sleep now. I've left a disclaimer for us on the main page of the wiki, but let me know if I should take down the wiki and try somewhere where we can get a private setting. I kinda just dived in to this :P