Hi Chesil, and I repeat Mwenenzi 's greeting

I've been thinking about your proposed itinerary as a Global Explorer, because it would allow you visit all your desired places, in particular Tahiti
Here's the itinerary I've come up with:

• PPT can be reached using QF codeshares (on TN flights) AKL-PPT and PPT-LAX
• The Global Explorer does not disallow LAX-HNL-PDX (whereas the Oneworld Explorer does)
• According to ExpertFlyer, AA does codeshare on one daily BA flight YVR-LHR, so you could book with the AA RTW desk
• I've PNH before SGN because if you're planning a roadtrip up to HAN then that will be easier to do in Vietnam
• At the end you have four segments to get from LHR to Norway, but only one more stopover allowed
  • All the segments can be flight segments (the Oneworld Explorer would only allow three more)
  • Transits can be up to 24hrs each
  • These can be taken months after your RTW trip (up to 12 months from the first flight)
  • Assuming you're planning Business Class (max mileage 34,000) then, playing around, I see Rome or Reykjavik can be reached
• I've no idea what the FF earning would be

ETA
As Mwenenzi said earlier, there is no dedicated Global Explorer thread on FlyerTaslk, but there is this one which compares the Global and Oneworld Explorers Musings: Circumstances where a Global Explorer might be better than a Oneworld Explo - FlyerTalk Forums
serfy recently posted how to get to the rule sheets on the Oneworld site, just pick Global Explorer instead of Oneworld Explorer - FlyerTalk Forums - View Single Post - The Oneworld Explorer User Guide