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Alex, I don’t say that our Universe is finite, I say that if it is fractal it leads to conclusion it is finite in macro size. Regardless of how our Universe comes to existence, our (theoretically) observable universe (Hubble volume) is a sphere about 46.5 billion light years radius. Beyond that, until we discover something faster then speed of light, we cannot observe, just speculate. The Universe could be actually be smaller if the observed distant galaxies are in fact formed by light that has circumnavigated the universe.
I do not have a problem with concept of “nothing” as it is same problem as to accepting infinity. However, same as you, I find it impossible to visualise it. I would not call it “sea of nothing” as”nothing” can not have dimension. My concept of “nothing” is that it is the possibility for something to exist.
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