Fascinating essay, thanks for putting all of that down. You have thought about this plenty. The only thing I'll add is that all objects live in the same space

Fascinating essay, thanks for putting all of that down. You have thought about this plenty. The only thing I'll add is that all objects live in the same spacetime. The metric of that spacetime is a mathematical object that obeys known laws under coordinate transformations, and the parameters of those transformations depends on the energy momentum tensor (likewise an object that transforms...). Trouble with GR is that the "trivial" solutions are heavy shit. So it goes.