I have looked into this a bit for a guy that wants a cool toy. The MRGB has different mounts. It has to be put into a jig that holds the 600 box and the frame in place while the mounts are fitted. There are only 2 jigs. They are not available to the public. I think it can be done by making a new jig. That leaves the tail rotor which is not like any other but could MAYBE be copied with the old whisper 4 blade. It takes a whole new tail boom not the 530FF type. Also the vertical fin is slightly different, along with fitting the bigger engine......
Anyway.....