Nah, I was just going to alter the theme to match my website’s eventual design. Having bbPress handle everything except whether or not the user is logged in is fine by my (although I was also hoping to make it display the user’s avatar, display name, and whatnot).
At this point though, because I don’t have much experience with extending WordPress, I’m just looking into writing my own custom system rather than play around with bbPress. While I could probably come up with a solution with some more effort, I can probably produce a workable forum that integrates fully into my system in about the same amount of time.