Electrical Metal tubing should be the same as conduit... needs to be galvanized. Never heard of the former...
The big gotcha with the conduit structure is the tinkertoy fittings... HOme Depot doesn't sell them. I get them from a swap meet (the vendor's main customers are other swap meet vendors) Or get parts for canopy shelters that people use for cars and such. Becomes somewhat expensive since they're heavy and that runs up the shipping.
5 feet unsupported for PVC is too much if you are going to put any weight on it... for 1 inch PVC I'd limit it to no more than 3 feet unsupported.
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