So, I was doing some stupid math.  I have come up with the following. Albion Spire is 2 miles tall. It is also 2 miles in diameter. It is strongly implied that it does not taper at all. The roof is flat. There are 250 habbles. From that, I calculate that given a reasonable thickness for each floor, there is only 40 feet of headspace for each habble, my question is, does that sound remotely spire shaped to you? Somebody please show me where I went wrong.