The head is attached with a rubber band and another little piece.
The legs is a special technique I found. Want the details, then check the following link.
To fight Dr. Bananabot =p
Some pictures are double but I not gonna search which ones
This is a great moded MOC of Evo, love of you put the Breakout Evo Helmet on the 2.0 head, the Tank Arm is the same but like that you add some things on it, and the boots are great. The body is great as well but I don't like those Pearl Dark Gray pieces on his back IMO.