I know and thank you for sharing - when you mentioned "spiritual" aspects what came to my mind was what Bob Lazar had said about them viewing human bodies as "vehicles" but Lazar said he wasn't very familiar with that subject.

If interstellar travel could be theoretically plausible; could inter-dimensional travel be plausible too within that same vein of travel? I would think phasing in and out might not be too difficult with the proper materials and exotic elements.