First Class Multiple Carriers Baggage Allowance Question

Searched in vain to confirm my baggage allowance on upcoming flight, but wanted to see if anyone else knows definitively.

Here is my flying situation, flights are paid tickets and I have Oneworld Emerald Status (on AA):

DOH-FRA (F on QR)
FRA-LHR (J on BA)
LHR-BOS (F on BA)

From looking at QR baggage site, it appears allowance is in the "Flights to and from all others countries," which would imply unlimited number of pieces concept, subject to max weight of 110 lbs for all checked bags.

However, since this itinerary covers multiple flights on another carrier than QR, would this be considered an interline and would then the most significant carrier rule apply? If so, BA allows 3 pieces of checked luggage of up to 70 lbs per bag. I also have Emerald One world Status (AA), which would then be an additional, 4th bag @ 70 lbs each? So 280 lbs of luggage in total? I believe that is the answer, but its not totally clear online, so I figured I would ask the pros!