The problem with Wiliamtown is that "after tower hours" is after 3-4pm each Friday and all weekend, and from mid-December to mid-January the tower and control zone isn't even there. There will not even be the assistance of the TRA that existed last year.
The mix of traffic will ensure that RPT aircraft will experience more restrictions on their arrivals and departures as controllers with only Enroute ratings will run airspace that is effective half Approach and half DTI.
Flexibility enjoyed coming into WLM outside tower/approach hours will be curtailed.