Crossing an international border as an unaccompanied 17 year old should not pose any problems. Just std. travel docs, i.e. a valid passport would be enough. The problems happen if they are with some one other than a parent. If traveling with someone other than a parent a signed notarized letter stating whom, what, and where, would be a good idea.
The other that you might want to look into is being declared an emancipated minor but that is probably overkill. But what are the term and conditions for live-a-board for being an unaccompanied minor? That might be the biggest hurdle. Have fun.