Most ferry systems just "T" into a convienent joint in the fuel lines.. .S.E. Pipers can pick up at the fuel cock under the cockpit center floor. . .Cessna S.E.'s can pick up one of the wing down pipes. . .The actual connection is pretty simple - diconnect the line - add a "T" fitting and reconnect the original line and the ferry tank line. The ferry tank(s) will have their own cock. The main concern is restraining the ferry tank in the cabin to 9G. Usually no gauges on ferry tank so start using it as soon as you are established in the climb and run the tank dry. Then you have the aircraft tanks with gauges to go on.
For N reg. overweight ferry permits can be had from the FAA - dont know about Oz. <img src="smile.gif" border="0"> <img src="smile.gif" border="0">