This Halloween I got the idea that I wanted to build a Dalek costume for myself. The end result took about 4 months to make, and about $200.
I'm not happy with the way the shoulders are shaped, but overall, I think it turned out quite nicely. It had a working voice/audio system, as well as working electronic components.
The ray-gun & plunger both had little controls on the inside as well. The door to get in and out of the Dalek was in the back, which you can kind of see in the first picture. It was held shut with a lock.