As soon as you post some build files, I'll start printing :)

I'm working on it, still fighting with the motors :-)
I'm trying to make it as simple as possible with wiring,feedback,controlling it. There are some servos on the market today with all these things inside of it. Servos with 360° of freedom, controllable and with feedback of the position connected on each other through serialisation.
Keep you informed!

If you make a new Github page for it, other interested parties would be able to contribute and review the current state of the project.

I am missing the obvious in the design. A rotating orange light to warn people (and animals) to stand clear and that it is operating.   ;-) 

Hi Olaf, there will be a neopixel ring on both robots positioned at the gripper.
With a neopixel ring you will have the possibility to give it any color and any sequence of animation on it with one pwm output.

I'm working on the small robot design and it will hardly be modified at the structure. It is very quiet at the moment, working on different parts of both robots. I have ordered some feedback angle magnetic sensors to experiment with. So I'm still alive :-) any progress may be expected the upcoming days.... I still hope to have a full working robot within the next coming weeks. It has to be perfect enough to play with it!

Little Thor :-)