OK, thanks for clarifying. I guess at my age, I just tend to think in simpler terms. The grid is fool proof, additional lasers can ger knocked around.
Mind you, I am not bashing at all, seems to serve his purpose, and frankly cool as he**, but in my mind, its another point of possible failure.
Gotta give big credit to anyone who comes up with this kind of idea, and sees it through to production and a working model. It the kind of mind that powers industry, so hats off young man !