This is an animated Gravedigger prop I made. It's mostly recycled from old props and molds I had in the garage, but I animated it in the "leering ghost" kind of way (bent PVC attached to upper body and running on a slow window motor). I attached mine to the window roller motor with Home Depot stir sticks and bolts. Here's the finished prop:
Here is a video of the inner mechanism and how I built it:
Let me know what you think!