The issue is, I want to accrue to AA, hence I don't want it to be AA plated, maybe QR or JL plated and fully QR and JL coded. Yes this ticket will be for mileage with little regard to actual vacation value.

That's the same exact issue I face. I think the best solution is to use a travel agent and plate on QR stock. My last one was QF plated (ex-CAI sale) via the OW tool, but will never do that again. I also reckon I could have saved a bit by plating on QR stock. It was nearly all JL and QR coded and the availability of JL codes to Brazil vs. AA only to other SA countries definitely dictated my routing choices.

Just as an FYI while you build this, there are QR codes now on a lot more AA flights to central America than there used to be, so it's possible to use those for some North America segments without adding a continent.

Yes.

Please correct me if I'm wrong but don't AA coded flights earn more AA points than QR code-shares on AA flights?

Lots of good info from pandaperth here, as usual. But this ...

... this is the key. :)

Not if you're crediting to AA. On a RTW ticket AA codes will usually credit on a revenue basis which is miniscule. QR codes will credit at 250% + status bonus. It's the opposite when crediting to QR PC. AA codes earn more than QR codes there.

Sometimes AA codes will credit as distance rather than revenue, but it's still less than a QR code. AA codes 'when' they credit on a distance basis are 175% + status bonus. But there is no hard and fast rule about what causes them to credit on a distance base vs. revenue base. I've had both happen, and there's an entire thread in the AA forum with similar experiences.

Even on a QR plated ticket?

Why not? The only things that determine how flights accrue to an airline frequent flyer program are the marketing carrier, the rules of the program to which you're crediting and the fare you're on. The issuing/plating carrier is irrelevant.

On a side note, I just learned that Matt's Planet is a source of this misinformation.. he recommends that one should plate RTW on BA if they want to credit to AY+...etc

Is the misinformation that plating carrier matters, or that it doesn't?

Of course it does not matter.
I believe the context of his comment was that if AY plated a RTW ticket, they would know the revenue and thus credit to AY+ accordingly regardless of marketing carrier. Therefore, he recommended that people should not plate on AY (which is kind of moot given the usual AA / CX / QR / QF that most people end up with).

I had never heard of him, so I watched parts of a few of his videos. Waste of time. He seems quite impressed with his travel experience and knowledge, but IMO his knowledge is less than that of the average FTer.

Every airline on an RTW ticket knows the pricing details, -- that's how they figure out what share of the total ticket revenue each airline gets for each flight.

Have to disagree about Matt's Planet, I would describe myself as an average (mean not median) FTer and if it wasn't for his videos I wouldn't be contemplating an RTW. I mainly only review the BA forum with some EI and AA from time to time, I only visited the Oneworld forum for the first time a couple of months ago.
After the slicing and dicing of the BA FF club, significant numbers of the club were left without a clear cost effective path to gaining premium status. Matt put together several videos - which he earns a living from - on the various Oneworld options to regain status. It appears that Finnair+ is generally the best option. I have looked at the Finnair website and it is nowhere near as eloquent as Matt has been!

QF Tickets Itineraries begining with a WY Flight (Oman Air)
 

I've been playing with ex-Africa Oneworld Explorer itineraries
Finally managed to price up an itinerary with WY as first carrier
Final price is quoted in AUD - so I presume QF would be doing the ticketing

Just an FYI for y'all

While true, the plating carrier is irrelevant in terms of earning, but most people plating on AA are booking via the AA RTW desk and therefore require an inter-continental AA coded flight. As you well know that dramatically lowers what they earn in AAdvantage.

Otherwise it's likely cheaper to plate on QR or another OW carrier depending on segments being flown, if you're using a travel agent.

How's that looking in terms of fees over base price? No one has talked about this setup yet.

DONE5: starting ZNZ (i.e. Tanzania)
- AUD14583 - base fare (=USD9499, which is correct for starting in Tanzania, according to EF)
- AUD3283 - taxes and charges