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The major problem will be rigidity in the long access. To have a 6′ working area your axis will be close to 7′ long… I am sure the weight of the router will bow the conduit.
I have a large build as well 60″ square with a working area of 1200mm the conduit doesnt seem visually to deflect with a dw600 on it at that length. I have perimeter supports at the mid point of each axis to keep the outer rails straight.