I am wanting to build a prop of the scene from the exorcist where the girl crawls upside down the staircase. I have the staircase. ...any ideas on how to get a girl prop to come down and then reset back up the stairs?

While passing through an area of Rome with lots of snooty fashion stores, my Haunter's Eyes caught this window display and stopped me dead in my tracks, so to say. Otherwise, not interested in high end fashion stores. After taking the video, I got the nerve to walk in and up the staircase...