Phantasmechanics.com and start sifting through the many, many pages of fascinating information and plans for Hallowe'en animatronics. This is a MUST.
Oh, and by the way, I said that I was a Phantasmechanic, didn't I? Scroll on down until you see a link on Harry the Hitcher, yep, that's yours truly. That was the first incarnation of Harry before he got a makeover. There's tons of other props there as well as safety hints and my favorite...The Dark Ride Project, the House of Shock made a dark ride from scratch...fascinating reading.
And yes, I'm an uber haunt geek!