As usual work and family matters slowed everything down. Moreover I lost my files in the most stupid way... and no backup.

Anyway I was going to make iteration 4 of the design (so not a huge loss), when I found these pics:

... and my doubts started to grow.

Are they spoilers? Should I try and add them to the project?

According to my measures the head diameter is just a bit smaller of an orange ring diameter, so it should fit. But now new questions:

Should the body open outside or inside in order to let the head enter? How to drive the head to the latch? Where to install the motor that opens the door? Are all 6 circles doors? and so on.

And what about the arms? are they external add-ons like in the toy? do they come outside from the grey parts in the circles?

I've been thinking about a "gyroscopic" body movement, but I couldn't find any literature about it. At least I couldn't find any holonomic mechanism driven by a gyroscopic mechanism.

In order to have opening doors and arms, the body should know its orientation. I think it will be a much easier task to achieve with a gyroscopic movement than with a hamster mechanism.

I would really like to start a discussion here, maybe in the comments, about if and how to add those features. Any idea is welcome!!

In the meanwhile I will see what I can do with the new Educational Boosterpack Mk II I just received from TI. I think about adding a couple esp8266 or cc110l RF Boosterpack to drive some motors wireless.