The particle model presented here is able to explain the structure of leptons and quarks without reference to quantum mechanics. In particular, it is able to explain quantitatively the existence of inertial mass without any use of a Higgs field. - An essential difference from the Standard Model of present-day particle physics is the fact that in the model presented, particles are viewed as being not point-like but extended. In addition, it becomes apparent that the strong force is the universal force that is effective in all particles.
Albrecht Giese, Albrecht Giese,
"Can the photon be described by a general particle model?", Proc. SPIE 9570, The Nature of Light: What are Photons? VI, 95700Z (10 September 2015); doi: 10.1117/12.2187452; https://doi.org/10.1117/12.2187452