I can't help but think about the amount of phase interaction from a line of transducers 200 ft long. I'm a little skeptical about the quality of the system.
You definitely have to buy some strands and test them out all linked together.
64 ohms impedance? Only 10 degrees vertical sound spread - that's very directional. As front fills you'd need to hang them down, rather than across, the stage.
Buy some and let us know how they work Henry!