No one else appears interested in this, but what the hell, I'll post this anyway.

I've decided, in order to avoid piracy/copyright issues, that my disc will ONLY include the movie and the four audio tracks (main, commentaries, and isolated score). No other features from the retail discs will be duplicated on mine.

I haven't decided about the subtitles. I'd like to keep them (particularly the trivia track), but it seems that it may be more trouble than it's worth.

The good news is that it seems likely that this will end up being a single-layer disc in the end (as the movie itself on the retail disc only takes up one of the two layers), so it'll be a smaller download.

I'll also be making a movie-and-main-audio-only mp4, designed for playback in PS3's and Xbox 360's, for convenience and the option to download something of a smaller file size.

--edit--

Wow, everywhere other than here that I feel people might be interested in this, my posts are deleted without explanation or I'm outright banned. And I'm being as tactful as I can be about it, too, not mentioning any sites and clearly stating that this is meant for people who already own the retail disc and not as a form of piracy or copyright infringement.

I guess there's little tolerance for altering a retail Doctor Who DVD outside of a freakin' Star Wars forum...