Dear Janko,
I think you have done a fantastic job with this essay. You manage to touch on many aspects of some very profound issues in a short space and also provide excellent context and referencing. I think the subject of consciousness is quite difficult and is probably beyond our current science, but it is perfectly legitimate (and interesting too) to speculate about it in an educated way. A few other thoughts come to mind:
1. I agree with you that "spacetime" cannot exist without "matter-energy," (I looked at your viXra article) but I don't think that this is widely appreciated.
2. You mention diffeomorphism invariance and background independence in GR, and in your viXra paper you mention a "simpler version of Einstein's general covariance." You also mention Markopoulou's "quantum graphity." If you have time, you might look at my essay here, where I describe a different interpretation of covariance and a graph-theoretic approach to quantum gravity that is somewhat different that Markopoulou's. You have evidently thought about these topics carefully, and I would appreciate any feedback you might provide.
3. Regarding the information-theoretic nature of the physical world, my hope is that quantum computers can be used to isomorphically model certain aspects of fundamental-scale physics (I also discuss this at the end of my essay).
4. I appreciate both your recognition that the dimensionality of spacetime must be explained, and your providing/referencing several possible explanations.
5. Two possible "explanations" for the arrow of time are to take causality to be fundamental (so that time is just a way of talking about cause and effect) and to use the asymmetry of a configuration space (I believe Barbour's shape dynamics does this) so that time is an intrinsically quantum phenomenon.
6. I agree that elementary particles ought to have a "spacetime interpretation." Over the continuum, black holes seem like a natural option, as you suggest. I prefer not to assume the continuum myself, but there are good arguments for manifolds too. Cristinel Stoica has an interesting essay here about "singular relativity" that you might like to look at.
7. I think the nature of time in GR should be taken much more seriously than in QT, since GR is background independent.
8. You have some interesting ideas about QG; I will have to think about these more. I am not sure the equivalence principle will survive in QG, but I agree it is nicer to preserve fundamental principles if possible. I won't presume to say anything about consciousness.
Thanks for the fascinating read. Your work rates very highly in my opinion. Take care,
Ben Dribus