now they have ordered -200s i could see the possibility of converting the 5 other -200s to freighters.
no idea if thats possible but they did struggle to sell them.
At the moment there is no approved conversion for 777s to freighters although Boeing have looked into it in the past. There is not enough 'feedstock' to make this program viable at the moment. The figures Boeing previously released was for the 777-200 (non-ER version as we have) to be a 60-odd tonne freighter. Not sure if this would interest CX or not compared to the 77Fs ordered which are over 100 tonnes.