I think that the NOMAC tracks are probably short ambient tracks, maybe with dialogs, sfx or some kind of music.
Since this album is going to be played live, it's reasonable to think that was composed with that in mind. So, the 1st act could be a whole theme, with an intro, and outro and a small break in the middle. I imagine the start of the concert without the band, with some sfx, lasers and maybe an animation of the descent of the nomacs, and them having DT in the stage performing the Overture (2nd track).