For the most part, I like a lot of your ideas. I do have issues with your voicing and orchestration, though. I'm all about voice crossing and whatnot, but it's not really practical for altos or basses to sing their respective low Ds and have them sing actually words - you won't be able to understand them, especially if we're talking an intermediate choir. I appreciate wanting very low, rumbly sounds, but if you really want the text to come out of the texture, I would have the soprano or tenor carry that torch rather than the altos or basses. In the same vein, though, I like how you have different text being sung at the same time, it creates a nice effect. All around, this is a very imaginative piece with a lot of potential - you just might want to rethink it to make it a bit more practical.