Hopefully, plywood could be found eventually. I believe that today manufacturer of plywood are located in exotic countries where they get the raw material. That should not be a issue.
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I have a friend here who is a professor at a university and an expert in composite so I should have access to quite a few manufacturer that can produce carbon masts at a good price. There should also be quite a few sources for aluminum poles if this is what you intend to use.
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Alain Dupuis