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i love the idea of using up used newspapers and paper towel rolls. i use old newspapers 2 heat my house in upstate NY much of the year. i have saved some cardboard tubes from paper rolls in hopes of using them with HO scale trains some day. this technology seems promising, but i would like to see the bearing area at the base of the arch module be wider, so that more load could be safely applied above. it appears that only some smaller pieces, a second modular item, would be required down at the base.