Rather than lashing it together there are a few simple options that would be quicker. If you have access to a cordless drill (ok a corded drill will work to but not as cool) just run a few drywall screws through the cross section and it will not move. Ok if you dont like that idea try drilling holes through above and below the pipe (offset to the side a bit) and put a nut and bolt through with a couple of washers. Simple. Just a thought. Hope it inspires better ideas.