I did, but it's not realistic. Maybe passively "aimed", but not actively steered, and not commandable. And even passive aiming is unrealistic at that price, act

I did, but it's not realistic. Maybe passively "aimed", but not actively steered, and not commandable. And even passive aiming is unrealistic at that price, active steering increases costs by several orders of magnitude. You can't possibly think that it's straightforward to model all those physical aspects for 16 trillion objects. We don't even have the 3-body solution solved; just predicting the gravitational behavior is unbelievably complex and chaotic. That many degrees of freedom is simply unsolvable (without quantum computing). It's hubris to believe we can predict even basic behavior and interference of such a project, let alone intended or unintended side effects, whether known or unknown.