Taking advantage of the ICN pricing, and looking to book the following DONE4:

ICN-HEL-xLHR-DOH-LHR-EZE-xSCL-BOG-SCL-xEZE-SYD-NOU-SYD-NRT-DEL-xHKG-ICN

Passes the MM validation tool without issue.

Stopovers:
Continent of origin (Asia): NRT and DEL (2 only)
Europe: HEL, DOH and LHR
Sth America: EZE, BOG, SCL
Pacific: SYD x2, NOU

Is there any issue with taking multiple stops in SYD? I thought you couldn't stop in the same city more than once, but couldn't see a reference to this in the rules.

Positioning flights are SYD-HKG-ICN vv with CX J class, using QF points.

Any pearls of wisdom? Itinerary is places I want to go, but always keen to maximise any status credits / miles where possible.