Here's a video from Youtube from the good people at Haunt Ventures..
A little larger scale than what you are planning, but good techniques which you should be able to adapt easily.
Hope it helps and best of luck!
I can build a static prop very well but I kind of such at motors. How do I wire up a wiper motor and hook it up to make a seesaw go up and down? My plan is to make a haunted playground addition to my graveyard this year.