I finished putting together my first OW RTW itinerary. It is a combination of business/study, visiting friends/family, and pure leisure. I think I have adhered to most of the rules found in the sticky, but I imagine there will be mistakes.

Itinerary:
HRE-JNB / BA
JNB-NBO / BA
NBO-JNB / BA
JNB-LHR / BA
LHR-BCN / BA
BCN-LHR-JFK / BA
JFK-MIA / AA
MIA-LAX / AA
LAX-SEA / AA codeshare with AS
SEA-ANC / AA codeshare with AS
ANC-SEA / AA codeshare with AS
SEA-SFO / AA
SFO-HKG-SYD / CX
SYD-AKL / QA
CHC-BNE / QA
BNE-ADL / QA
ADL-SYD / QA
SYD-JNB / QA

Summary:
20 segments including those between regions
Both oceans crossed (3 even)
4 continents: Africa, Europe, North America & Asia Pacific
-3 segments in Africa
-2 segments in Europe
-6 segments in North America
-4 segments in Asia Pacific
No stopover in HKG (hopefully can time it to maybe go into town)
Will claim miles/points with BA & AA

Questions:
-I have a few open jaws; are they allowed on L & D fares?
-Are the AA flights on AS metal permitted?
-Would there be any way to eliminate Europe to make it a xONE3 (BCN is purely for fun, so not really necessary).
-When I get it right, can I just book it with my local BA agent, and then ticket and purchase it in HRE (or even better, JNB)?

So, what's wrong with my itinerary?
Thanks for all your help... be nice; I am still new to this!