Before I explain this guy's story I'd like to apologize for the bad quality of the pictures. I don't have the best camera or the best setup.
Vahktor was something that Nuparu was working on as a replacement for the Vahki. It was meant to seem more friendly but also very defensive. However he was never able to complete it before the Great Cataclysm occurred. There was only one model and it was left behind.
It had more of a drone appearance and as I said, it was a prototype thus the clunky and sort of ugly appearance. Nuparu managed to find this guy in this state when they returned to Metru Nui, the miscolors are meant to represent the damages.
These two pictures are an attempt to show where his joints are.
Size comparison to a Mata Nui Matoran (Yes, that is Nuparu with a punching arm and a normal head w/ Krana. I like him with normal arms and I can't find his head/mask).
EDIT: I forgot to add a shot of the back, not really anything to see for the limbs so I zoomed in on the main section. I also got it at an angle to show more detail.
In reality this was really just me testing out some building techniques I could use for moccing. It is pretty bad so feel free to point out everything wrong with it. It's also sort of my first MOC I'm posting here. I'm not really satisfied with the pictures I took that tried to show it's articulation so if anybody wants more pictures then I'll post them. There's about 3 main joints in each limb though. That's pretty much it for this.