kingmomo
There is only one catIII ILS in Australia and that is a catIIIB ILS on rwy16 in Melbourne. Required vis varies based on aircraft but for our company Airbus is 75m and Boeing 100m.
I find it hard to believe any captain would tell you that the system would taxi you to the gate. All it will do is allow an auto land with an auto roll out on the rwy. You're on your own for the taxi in except for precision ground radar for taxi guidance though without checking the Melbourne charts I can't tell if that is installed.