Re Williamtown, I was not involved in the decision to change the level of the class E airspace. If I was responsible for the detail it would be done correctly- just as the AMATS changes were.
No doubt it can be done using en-route standards but I don't know why someone would want to do it this way.
Thanks Dick, that clears it up for alot of people who were wondering, including me. You are right to wonder why anyone would want to do the airspace this way. As I have pointed out, it will increase delays and disruptions to what the traffic in that area normally experience. It also has the potential to be alot less safe.