The outer shell is held together by internal plastic clips. The two halves come apart at the sides. If you can free a single clip, the rest will slip out, and the rest will fall apart with minimum effort.

As you can see, I was a bit rough and broke one of the clips a little bit. I'm not too concerned about it, but try to avoid doing the same if you can help it.

Some other pieces may fall out. Including the battery hatch, and some metal pieces. I'm not exactly sure what their purpose is. Perhaps structural reinforcement, or something like that.