Make Roland's Nero Model More Flexible?

Can some one make Roland’s Nero model rigged better?(No sure if rigged is the correct word) But yea I think the Nero model needs to be more flexible so he can bend and so on instead of being able to just stand straight. Just hoping if some one can make him more flexible.

Link to model: http://www.garrysmod.org/downloads/?a=view&id=103528