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Lynn Westcott, I believe - suggested you could use two 1/4 inch hard board laminated together, and you would have sufficient strength, but most have never tried this. He did say to seal it with a paint sealer so moisture wouldn't be a problem. If you have two layers of laminated hard board, or plywood (that most use - I would use ply wood), then you overlap each layer so that building the circle is easy. If I were building one - and almost all my friends have helix's on their layout - some more than one. I would use L brackets to attach the circular helix to the support poles (can't think of the proper word right now) on the inside only. So quite rightly you are thinking that the outside circles unsupported would be wobbly - and they would be. Although normally I'm not a chicken wire kind of guy for support building mountains, I would use it on the outside of the helix, nailing it to the plywood. I then would - for the sake of speed - use plaster gauze and plaster all the chicken wire. Once the plaster gauze has set, your helix will be very solid.
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