For a hex set, look at http://www.mcmaster.com/ and search for Allen keys. The hard part is broaching a hole for a hex that small. I ended up using a round hole. Works very well, IMHO.
BTW, I made a round set very similar to the sets above and have measured drawings and materials lists if any one is interested. Just shoot me an Email or PM.
And, if making a PE bender, don't settle for an Etchmate copy, copy the Fender Bender. Of course, I make that, so I am a little partial!!!