Whatever the overall transformation, it's cool. I think there are also panels we can't see. Look at the back of the legs (red arrow) you can see what appears to be another layer beneath the part that becomes the poles. And look at the yellow arrow. I think that the armor bits on either side of the knees rotate. The little raised parts look like they may part of the back side of the planet. I can't see the "teeth" in the collar but if they are there, then maybe the obvious source of the pincers in planet mode are the robot horns?