Anyway, my concept is not of another dimension, it is of total nothingness: no time, no space, no matter, no nothing - and then “somethingness” being created at the extremities, perhaps as it has been since the beginning. (No “big bang”, more of a “big creation event start”, which I think carries a different connotation.

I've long struggled with the notion of nothing. Or, as you say, no nothing. What, exactly, is THAT? I often refer to it as erstwhile nothingness. It's what you'd have if there weren't something (in which case there'd also be no you to be nothingless). Dealing with nothingness and infinity is truly a mess.

As we're starting with awareness of experience, there's no question as to whether or not there's something, even if it's simply awareness.

I've no problem with ignoring the probability of extra dimensions. Up to eleven dimensions may be hypothesized in string theory, but that's not my domain. However, in considering the complexities of present experience, I've wondered whether my exceedingly volatile cognitive processes, which are real in the sense that they're experienced, may be described as ephemeral extra dimensions. But that's a matter for another discussion.

So we've got something, and from our earthly perspective it's expanding, in my view originating in a non-dimensional singularity that may be regarded as the infinite potential of erstwhile nothingness.

To the best of our present knowledge, emergent experiential evolution materializes as complexifying relations among boundlessly elaborating existants, in the human realm boiling down to boundless perceivers of the cosmos, organs, cells, molecules, atoms, nuclei and ephemeral quarks, the latter negotiating infinite probabilities in harmony with their macroscopic relations.

I'm suggesting a hopefully less anthropic perspective: boundlessly imploding complexity ever emergent within infinite potential. As I see it, whatever we may experience is necessarily included within the infinite possibilities inherent within erstwhile nothingness.

I hope you don't dismiss that as just another "word salad" as I'd much prefer a mutually respectful exploration.

Tom