I finally assembled the thing and it all works fine.
I have started working on motion control system. Long-term I want an intelligent self-learning software similar to how living creatures learn to walk. But first I wanted a dumb software that is capable of basic movements, such as get up, sit down, walk. Even this turns out to be harder than I expected.
I believe most robots out there are based on servo motors that can be instructed to hold a given angle. My motors kind of do not. I designed this thing from the very beginning to be soft and dynamic, like living creatures are. Cool long term, not so cool for cutting corners. Also it only runs at half of the voltage. Given capable software it would still be able to stand up and walk, but no half-voltage is no good for cutting corners either :)
Anyway, I need to implement at least simple movements in order to seriously present this concept for investment/collaboration purposes.
Stay tuned for better movements and body V2.0.