I've just been opening mine, and are amazed by the ease of transformation.
Thanks to your review, I now know what the extra gold 'arm' is for, that it goes with the repair bay. Couldn't find any information in the instructions about it, and the "lift pillars" are pretty mysterious. I wonder if its a story plot point, or if it integrates with another (unreleased) Cyberverse toy?
I have'nt been able to find any youtube reviews that explain it either.
On the lookout for MISB Headmaster Highbrow, Takara or Hasbro. I'm sure I could make you a sweet deal!