B777-200ER Pax figures
BSB
I don't know where you got your pax figures for the B777-200ER but they seem very high - more appropriate for the B777-300. It might be physically possible to squeeze that many seats into the aircraft but the seat pitch would be unacceptable for the long haul flights that these aircraft excel at. With sleeper seats in first and business class the numbers would be much lower.