BDgeek, thanks for the compliments! But without the help of the other members (Jonno in particular) this project could not be done!
I decided to drop the DTS-HD MA (if someone with the BD wants to use it, he just has to remux this project video with that audio); using all the soundtracks I listed, there is about 18GB for video, more than enough to retain the best quality available - think that the original HD-DVD video is about 12GB...