Hi - I made a wooden coffin and I would like to have the lid go up and down when someone comes up to the porch. I am not mechanically or electrically inclined. I was looking at Monster Guts Monster Prop Power Pack to make the lid go up and down and I was looking at their pressure step mat to trigger to lid. I don't know if this is all I need to make this work or are there other items I need to make this work? I am a little overwhelmed, but I would like to try.