RE: Recommendations on control rods?
2-56 threaded rods will do fine. You can get them in various lengths.
One thing to look out for . . 2-56 and the metric 'equivalent' look very similar, and the clevises LOOK as if they are interchangeable. They are not! You run the risk of threading the metric clevis onto the 2-56 rod (or vice versa) and finding out later that the threads aren't the same and the clevis slips. Not a good thing when flying!
-David C.