Coming up next is figuring out how to actually join the segments in a way that they can be disassembled for transport and still strong enough to not break apart. 

Maybe an "O" ring on the tenon half of the joint? The rubber will compress and tighten the joint, a little lube every once in a while should keep it working.  Just a thought...

That would require a groove to keep it in place.

I'm probly going to let you down but, I swear I won't keep you down. John Hiatt