I don't know how you'll take this, but I can TOTALLY hear Johnny Cash doing this. I mean it as a compliment.
Man, "ambient" is an understatement, lol. I love the slide, just b/c it's so freaking different. I can see why you'd be curious as to how it hits people; I really kinda' wish you hadn't mentioned it, lol...b/c I was all waiting for it, and it wasn't as weird as I was expecting, I guess. I vote for keeping it, as if that matters.
As for the ambience, I vote for pulling back on the verb A TON. I think it's just muddying the whole mix up, and you don't need it.
(come back out of the chamber hall reverb, lol).
Your voice crapped out in a couple of places, which I'm sure you probably know, but...just to let you know I'm listening, lol.
Seriously, I'd re-attack a couple of the vocal clams, and I'd pull off of the verb a bunch, but then again, I'd probably smear the whole thing with compression and autotune, so take my advice for what it is...well-intentioned.
