[sgreco]

Yeah, each piece would be used as a rod. They make nuts that slip into the frames. You'll also notice that a 1/4 20 button head bolt will slip right into the extrusion. If you use 1x1 inch, you can tap the end with an 1/4 20 thread, then connect it by slipping a bolt head into one piece and tightening it to the tapped end of the other. You can tighten it by drilling a hole right behind the head of the bolt, so you can get an allen key to it. It's hrad to describe so this may not make sense. If you use Loctite it will suffice for a frame. My did it in 2008 and it worked just fine.