Great reading. Where single-narrator podcasts beat audio-drama podcasts is that if the reader has imperfect equipment, after a while you start ignoring it. (Within reason.) Mike Bori's equipment wasn't awesome, but it was good enough and after about five minutes I stopped noticing the quality of the recording in favor of the story.
The story was great, though I too missed the Rabbit-clone angle. I do like the way the author dealt with the subject/verb agreement when they were down on Mars; I've had similar situations in my own writing where I've had to figure out how to pull that off. The techno- and historial-infodumps were too long in places, and a bit preachy; I found my attention wandering during a couple of them. I think I've figured out how the zombies used electricity to stay alive.
The concept of a vertical city has always been cool, perhaps because I can't think of any examples of such cities existing today. They also provide good dramatic tension in that you can go up or down as the plot/story requires.
The title was a tad misleading. I can't explain how, but I wasn't expecting what I got.
Overall a very good episode.