Wise Old Owl -- The ridge pole made from the top rail of chain link fencing materials is a major element in this set up. ( Thanks to Risk for showing this in his portable stand plans, although he doesn't actually connect his hammock to the ridge pole in his system.)
It is cheap, light weight, accessible, and easy to work with. Do yourself a favor and start by going to your local supplier ( Lowe's, TSC, etc.) and check them out before you try to substitute this element with some other pole. I know from expensive, hard earned experience on this one.
The chain link fence top rail is 10' long and designed to fit 3.5" of one end into the next piece. One end is smaller diameter than the other --sorry I don't know the term for this. What this means is you can cut it in half and reverse the pieces and they reconnect. Probably this is all you would need to do if you get a first quality piece for starters. Lowe's sells bent poles for 50% off, and these seem to be readily available. I use three pieces with a separate connector only due to my quirky development process and unique specs for several applications. Using only two pieces would make putting the system together much easier.