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Ed, Another possible way to create your dome is to go the geodesic route. This would be very light weight and plenty strong. Once the dome shape is in place you could use teardrop shaped pieces of sheet metal and overlap them on one edge until you had circled the top. The tear drop shape is close to perfect for making maximum use of sheet stock.
Another thought is building a graduated set of rings from 1x1 stock and topping them with cedar shingles. Under either of these designs you could apply a sheet of rubber roofing membrane.
 
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