great to see this - and it's shaping up to be very atmospheric indeed. I like much of the cross-cutting - on the pre-viz it appears that you're exporting it at 25 frames per sec (or 24?) - check your project settings, because you've got that 'pausing/jerk' throughout and that happens to me when I export media originally made at 24 fps as 25fps. I know it's only pre-viz, but nonetheless... I'll watch it again and make some more detailed notes. Watch this space.
Wow Ethan, this is really atmospheric and creepy already, and it's just Pre-viz. Can't wait to see it rendered.