A solid lattice structure of the vacuum as bound electrons and positrons, analogous to a polycrystalline ionic salt, was proposed and termed the "epola" by Menahem Simhony in 1973 and argument is provided for validity of this model. Application of the model leads to a physical interpretation of the bending of space detailed by GRT and provides explanations for gravitation and inertia as electromagnetic effects of the lattice with justification for de Broglie waves.
The spectrum of electromagnetic waves in vacuum space is discussed as a function of the vibrations of an
elastic electron-positron-lattice (the epola model of 1973 by M. Simhony). It is shown how wave propagation is subject to a finite velocity by an extension to the model for quantum substructure of the electron responsible for spin interactions stabilizing the lattice in a frustrated magnetic system. An implicit cut-off frequency for EM waves leads to the structure of mesons and potential reconciliation of Quantum Mechanics with Relativity Theory.