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The stuff you got is EMT if it has a thin wall and isn't threaded.
It is easy to get confused, as many people have many different ideas about what and how to build an aerodynamic bedcover. This is mainly because there is no one right answer. Even some of the "wrong" answers that go against everything everyone suggested so far are better than no bed cover. I built mine the way I wanted (matched to AST-II in side view) out of the materials I wanted (foam/fiberglass). When I build my next one I plan to build it differently (AST-II in both plan and taper view, aluminum structure).
You get the benefit of doing the same, decide how you want to build it that best matches your needs, desires, and skill set and based on what design balancing complexity, utility, and aerodynamics. I will say that copying what other members have completed and proven to work probably is easier than plowing new ground.
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