If you are using computer conferencing, you have a technology that facilitates interaction, and you will want to take advantage of it. There is another reason not to automatically replicate the classroom. Doing that assumes that classroom teaching is an ideal to be copied. When students walk into a classroom, they see you at the front of the room. They also don't know what to expect, and you need to make the feel welcomed.
Virtual space is mostly shapeless.
A classroom or your living room has a shape, has furniture and projects an atmosphere. In a classroom, the arrangement of desks makes a statement about how social relations will take place. I have a colleague whose office is arranged so when you walk in the door, you are faced with his desk and him sitting on its opposite side. Another friend has his desk facing the wall and his chair and yours have you sitting knee to knee. These two offices make power and status statements.