You need 4 wheels, 4 bobys, 4 legs and 2 bases. You can paste them with so much love and a few of cyanoacrylate (super glue).
I repeat: "I'm sorry for the lack of documentation I promise it will be more complete in the next version, Gamma Project."
The code's anotations are in spanish but I think it is understable. It is in progress too.