BEagle is right....these cunning chaps in TLS will have given this whole process considerable thought and careful analysis. They ( Les Engineers Francais) have a track record on matters of this scale ( Airbus, Ariane and TGV can't be wrong).
As to F747 comments..I did not mean to imply that following this procedure would limit the growth.....just that as the longest journey begins with the smallest step (Mao) I'll bet Airbus don't jump in and demo for DGAC benefit the maximum seating evacuation . Want a tenner on it ???