In relation to this question.
Edit: The original question has been edited. I'm delighted to see the OP working to make the question more appropriate for this site, but to fully understand my question, you need to look at the linked question's edit history and review it's original form.
We occasionally receive questions that, according to our rules, really belong on another SE site. The only problem is, said questions would never survive the VTC rules of those sites because (frankly) the questions aren't a serious investigation into the topic.
The reference question above is a good example. For the most part, it's really nothing more than a physics question and belongs on Physics.SE. But as Cort Ammon points out, they would never accept the question.
For our part, even if you removed the "how would such a ship affect the universe around it?" part of the question (let's take one theory, squeeze it to look a bit like another theory, build a ship the kind of which we know nothing about, and how would that ship affect the universe around it? It's 100% unanswerable), the rest of it is so primarily opinion-based that it's hard to imagine one correct answer.
But, we occasionally see these kinds of questions. Not 100% worldbuilding. Not 100% anything else.
Question: I beg you to forgive what will sound like an uncompassionate question, but do we want to become the dumping ground for questions that other SE sites don't want to deal with?
I ask the question intentionally harshly, because my knee-jerk reaction is to cut people some slack. We're likely the most creatively-oriented site in the SE universe, and with that honor might come a bit of responsibility to pick up where everyone else leaves off.