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Hi Ian, I believe there was an artical in Garden Railway magazine some time back about building molds from the foam Old Dad mentioned. If you use old hangers for reinforcement, burn the coating off them first for a better bond to the concrete or try using Hypatufa instead of concrete. Do a google search to get more info on Hypatufa, but it is a mixture of Portland cement, Peet Moss, and Pearlite (and other things depending on who's formula you use). About 1/3 the weight of concrete and looks like stone. Good luck with your project.
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