subways and sewers

>My own thoughts are leading me to a vision of a habitat that has an
>extensive infrastructure "underground". I'd even venture the
>opinion that a substantial transportation network could even be
>incorporated. Now whether that transportation system would be
>comprehensive, I'm not so sure, but I think it could be incorporated
>and service the majority of residents. Now that doesn't mean it
>would have to be public transportation. It could be a network for
>electric personal vehicles, Skytran systems, etc.
>
>I'd even go so far to as put storage, factory, and support
>facilities underground. I'd preserve the above ground buildings for
>housing, schooling, recreation and office space.

I'm for hiding the ugly stuff too, but consider how inflexible your world
will be if one can only live in sites to which the planners have put water,
wires and transportation connections. A few decades of cylinder
civilization will probably suffice to prove to people that a little normal
human chaos is necessary for survival.