Looks pretty good. To maximise miles you may want to consider LAX-SJU-JFK instead of LAX-JFK and JFK-DFW-ANC instead of JFK-STL-ANC (depending on when you go, DFW-ANC is seasonal). Also, I don't think you're permitted SYD-PER-MEL, only one transcon in Australia. And finally, if you are desperate for miles you can substitute a Middle East destination (e.g., DXB) for IST or PRA (do you mean PRG=Prague?)