Here's a link to Roseberry Topping that has some good pictures. About 7 pictures down the page, you can see some of the boulders from the collapsed face. The area is owned by the National Trust, so I suppose we would be trespassing if we didn't get their permission. I'll try to go for a recky first to see if there's a suitable stone. If so then I have a pal who knows someone at the NT. He may be able to get me in to discuss the project. It has to be worth a try.