Speaking about the British Airways Boeing 777 fleet exclusively, there are four different seat maps for the aircraft: 777-200ER with first class, 777-200ER based at LGW, 777-200ER, and 777-300.

“I am still adding to the cabin. All the parts used were removed from British Airways Boeing 777. The estimated cost of it all including the trolleys, seats and parts is around £2,500 ...