This MOC is by Gevorg Perviy, who appears to go by Brick MOC Build on Youtube

In this 21 minute video, Brick MOC Build starts by opening a box of parts, and then assembles the majority of the creation for the viewers. This makes for a great learning experience that breaks down a lot of otherwise complicated looking tiny details.

The MOC itself is a revamp of the official Hero Factory set by the same name, and Gevorg’s revamp takes everything from the original and fleshes it out more. Rotor’s new incarnation certainly looks much more flight-capable than the original. I especially like the liberties taken with the tubing, adding some to each of the limbs, and connecting it to the back.

If you want to see more of Gevorg Perviy’s work, he appears more active on Instagram, and seems to favor BIONICLE/CCBS creations. His youtube account only has four videos at this time, however they each go into just as much detail about the construction of a MOC.