This sounds like a great project. Good job so far, Tellan! As far as the soundtracks go, I would think that with DTS 5.1, why is the PCM needed? I would suggest putting in the mono soundtrack, for the many audio differences, with the DTS and drop the PCM audio. It would be a repeat of the same audio. A well-done DTS track would be great to have on a set.

EDIT: After thinking a bit, would there be any notible difference in audio quality by going with Dolby 5.1, given the source is PCM audio?. Dolby is much smaller, after all.