Bedek did work on an older 772 (I want to say ex-MH) at TLV to figure out how to do a conversion that didn't cost $100 million. Supposedly it was a success according to them, however the aircraft was scrapped. Bedek claims they had a launch customer a year ago however: 1) the converted aircraft never flew 2) the conversion is not certified and 3) there is no feedstock in conversion.
So as for now the p2f program for any 777 is vaporware.
I understand that another company also worked on a 777 p2f conversion package; but, like Bedek has never sold a conversion.
The base problem is that the 777 passenger aircraft are built with composite floor support beams to save weight and lower fuel consumption. Passengers are light compared to freight. The 777 Freighter is build with metal floor support beams and a beefier floor itself which can handle the weight of freight (also has other freighter friendly features built in).
A p2f conversion of a 777 requires the replacement of the floor support beams (change from composite to metal) and new floor in addition to adding a freight door and other features. The flooring changes are structurally significant and costly.... I am doubtful that there will ever be many - if any - actual 777 p2f conversions. It's way more expensive than other p2f programs.
I understand that Boeing has projected a robust future for the 777F, and intends to keep producing the current 777F even after they are producing the 777X passenger aircraft. It is possible that one of the 777X aircraft will be new built as a freighter in the future. I suspect we will see the 787F offered first...(I know that Boeing has that on the drawing board and planned for a 787F version up front).
Have a great day,