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Roadtrp, I haven't gotten this far on my layout, still laying track. [:D] However, when I get there I think I will use glue shell technique. A couple days ago I started an experiment using foam rubber and hydrocal to make tunnel portals and retaining walls. I cut the foam rubber to size and generic shape. I made up some watered down hydrocal and dipped the foam rubber in it, squeezed it like you would a sponge in water, then laid it out to dry. I haven't check it yet to find out if it is workable, i.e. filing and carving, but will post the results here once I find out.
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