This preprint is a structured, comparative survey of several independent mathematical and physical frameworks that have been proposed to reproduce, or closely parallel, certain structural motifs seen in the Standard Model (e.g., three-family patterns, mixing-matrix structure, and characteristic hierarchies). The intent is evidential and modular: to catalogue proposed correspondences, cite the relevant sources, identify the assumptions required for each mapping (including any parameter matching), and state what would count as decisive falsification or independent replication. A core clarification is maintained throughout: this work does not propose a return to a material luminiferous ether. “Superfluid vacuum” is used as an effective/behavioural analogy (universality-class language) for vacuum dynamics, not as a claim that space contains a literal substance. The paper distinguishes (i) established results from the cited literature, (ii) the specific correspondence being asserted, and (iii) the additional modelling assumptions needed to interpret that correspondence physically. Frameworks discussed (overview) The manuscript surveys correspondences drawn from nonlinear wave theory (discrete mode spectra), emergent/analogue metric approaches in condensed-matter systems, algebraic topology and topological invariants, proposed geometric relations connected to empirical mass formulas, classical coupled-oscillator analogues of mixing behaviour, lattice/phonon band-structure analogies, and information- or geometry-based proposals related to dimensionless constants. Where a source is not peer reviewed or not independently verified, it is explicitly labelled as tentative. The overall programme is presented as a set of research questions rather than a proof of a unified theory, and is intended to support targeted critique and selective testing of individual correspondences rather than “all-or-nothing” acceptance. Status: Preprint (not peer reviewed). Discussion and replication notes: https://github.com/Gptham123456/Hydrodynamic-Quantum-Gravity/discussions