It looks like a valid itinerary to me. In terms of improvements it depends what you are trying to achieve. For pure miles there are a few improvements possible...

In Asia you could replace KUL with CMB which others have reported as a relatively painless turnaround (or DPS/CGK).
ORD-JFK-SYD is more base miles than ORD-LAX-SYD although I guess maybe not so good if you can do the AA sector in First whereas the JFK-SYD would be in D all the way. You have the same problem with the SJU flights. You get miles for D, not A.