I am also wondering how easy it is to transit Amberley CTR? The track around it seems to indicate that the PIC, for whatever reason, thought it would be more expedient to skirt it.
The Amberley military control zone extends from ground level up to an altitude of 8,500 ft (Figure 5). The airspace was active from 0800 to 2300 on 29 August and required a clearance to transit. Preliminary information indicated no record of a transit clearance request by the pilot, however, additional information is being collected by the ATSB to verify this.