I've tried to figure out your itinerary, using some random dates starting 15JUN... Here's what I've gotten so far:
OSL-MAD-xDOH-KIX,SIN-MEL,SYD-xLAX-oSFO-xDFW-YYZ,EWR-DFW-OAK,NYC-xMAD-OSL
When I price this out using SABRE it gives me the following:

So a price of NOK57,959 (USD 5320) and USD856.98 in taxes etc. for an adult. (Total price in NOK is 67293, if I assume same price for child - shouldn't be but just for now.... - its a total of 269,172) - saving you a fair bit against 316k because of AS validating.
You're at 11 segments currently - I'm not sure I'd probably avoid doing the KIX-SIN surgace segment and perhaps even the MEL-SYD surface and just fly those. Let me know if I can help further.
Cargo