I need some advice on building a Hill for our production of Lord of the Flies. It needs to be able to handle a few bodies on it and have a rounded look with a flat top, much like a cliff. I'm trying to figure out how I can build it up so that it has a lumpy look to it, but is function for people to climb on it and fall down it without getting hurt. I was thinking about building a frame with trusses and plywood then building it up with sand bags or bean bags then covering with with green turf.... Does this sound doable? has anybody build a hill in their as part of their set and have any advice?