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would it be possible to make a mold of a portion of the load, then shape some foam to the size of pile then lay the casting on the foam and blend the castings together? I have been thinking about this question for some time now, and I haven't come up something that is 100% yet. I have never made a mold, so I haven't tried it, but it might be worth a look. A website I ran across awhile back used a similar method, only he made an actual pile of the "seeds" and then made a mold of it. But prototypical piles are quite large and are in a huge rectangular shape, so if you are looking for prototype, then actually piling up seeds might be a chore.
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