Σεμπερ Ϝιε, The Cubeᵍ: A Holographic–Relational SMN–Q42 Model of Form, Fit, and Function introduces a structural framework in which the universe is modelled as a discrete relational code on a finite cubic lattice Cubeᵍ ⊂ ℤ³, and smooth continuum fields (space, time, electromagnetism) are treated as emergent approximations of an underlying integer substrate. The work is organised around a triad of Form, Fit, and Function: a continuous inverse–square baseline (Form), its sampling on a cubic lattice (Fit), and curvature-like loads and path dynamics on that lattice (Function). A Milesian Greek operator alphabet is used as a relational code, anchored in the motto Σεμπερ Ϝιε (Semper Fie), which is read as an operator equation linking aggregation, events, modes, projection, curvature, triggers, and informational indices. On this arena, the paper develops: a discrete cube geometry with 24 named path families (“linie”, “schlange”, “wieder”, “Cascade”, “NOW”, …) as traversal modes; a triplet decalogue of integer triples encoding five archetypal stages (Horizon, Stage, Heartbeat, Sky, Return) and a characteristic asymmetry band {66, 67, 68}; a digit code, interpreting the decimal digits 0–9 as dynamic factors with specific integer ratios and a common shell at 351, with digit 0 anchored at 1/(5√2) ≈ 0.1414. A solar-system sector shows how this codebook can be aligned with coarse observational scales: the correction scale Δ = 133 and a deficit of 13 combine to a heliopause marker near 120 AU (Δ−13), and an effective ≈66% : 33% split between bulk flux and habitable remainder is read as a projection effect of the Cubeᵍ geometry. The classical electromagnetic field is interpreted as an emergent, coarse-grained description of information flux on the cube. Additional examples illustrate how the same integer vocabulary (Δ, 13, 42, 246, 351, 866, …) can structurally encode the electron rest energy, the proton–neutron doublet, and superheavy digit patterns—explicitly without claiming new physical constants or a replacement of general relativity or Maxwell theory. The manuscript is intended as a structural codebook and hypothesis about discreteness and holography, not as a completed physical theory. A strict non‑commercial, anti‑AI‑training license and explicit BigTech exclusion apply; see the included IP and license statement for full conditions.