Personally I think the danger of cedar bedding is oversold on this forum, there being little if any sign that people who DO bed with cedar shavings HAVE problems. Also note that commercial broiler barns sometimes use cedar as bedding, and they would not be doing it if it caused perceptible problems, although their birds are quite short-lived to begin with so I suppose more chronic problems could theoretically still occur.
That said, there is enough *theoretical* reason to avoid cedar that I would not personally use it in an enclosed area. Outdoors or with mucho ventilation there is no particular concern that I know of. IMO if, when you use it, the place still smells like a cedar closet the next day, it may be iffy; but otherwise, probably unlikely to cause harm.
Pine shavings are generally CHEAPER though - buy 'em from a feedstore in big bales, not from a pet store.
Good luck, have fun,
Pat