First, you are only away for 8 or 9 days. Your last intercontenental flight has to be 10 days after your 1st flight. Second, from a QF status credits view point, LAS-LAX, ORD-BOS, & MIA-DFW do not maximize the QF status credits. Also, I would fly the 4 QF segments separately from the RTW since you are in Australia and those can be had for little money. Use the save segments for other longer segments. Lastly, I would drop the trip to JNB and instead use QF to SYD-HKG -CGK-NRT-SIN-LHR... for more status credits but fewer bonus miles.