The Unified Field Substrate Model (Version 3.2) presents a comprehensive framework titled "Emergent Gravity, Electromagnetism, and Matter from a 13-Point Nodal Truss." This preprint proposes a physical theory where fundamental phenomena emerge from the mechanical dynamics of a discrete, non-local lattice substrate, moving beyond the ontological primitives used in the Standard Model and General Relativity. The work argues that spacetime, particles, and fields are not independent entities but are instead emergent structures of a three-dimensional nodal truss characterized by 13-point coordination. In this updated version, the model formalizes several critical areas of theoretical physics. It derives the effective spacetime metric and the full Einstein Field Equations by treating gravity as a refractive effect caused by density fluctuations within the substrate. The electromagnetic sector is established by mapping U(1) symmetry to local lattice phase rotations, allowing Maxwell’s equations to be recovered directly from rotational dynamics. Furthermore, the model addresses the nature of matter by identifying quantized particles as stable vortex ring solitons and deriving the half-integer spin characteristic of Fermions through topological twists in the nodal truss. A significant advancement in this version is the first-principles geometric derivation of fundamental constants, specifically the Fine Structure Constant and the proton-to-electron mass ratio, which are calculated based on the 13-point packing fraction and lattice impedance. The model also offers new interpretations for the dark sector, viewing Dark Matter as large-scale vortex defects and Dark Energy as intrinsic lattice vacuum strain. By providing this mathematical formalization, the document transitions the hypothesis into a testable theoretical model with specific predictions for high-energy physics and cosmological observations. The associated keywords include Unified Field Theory, Emergent Gravity, Lattice Vacuum, Quantum Geometry, Topological Solitons, 13-Point Coordination, and the Fine Structure Constant.