Oh, yeah, no it's definitely not getting larger. The thing is that with the lossless audio, the movie may come near to 20GB even at the current bitrate (although that's just my assumption, as no one was able to tell me how large lossless audio normally is) so I quite like the suggestion that I'd make a BD with menu and film only (maybe just some little extra) and then make a complete bonus disc for the whole trilogy later, giving me enough disc-space and time to give the bonus material the bitrate and attention it needs.