AA geometrical/mechanical model of the proton is developed which satisfies general empirical features. A Yukawa / Paris-type potential due to a mesonic field is incorporated into Einstein's equations of general relativity to predict a hadronic force constant, stronger than the fine structure constant by (137/√3) times Proton mass is expressed in terms of muonic mass building-blocks. Analysis of the magnetic moment allows substructure modelling, incorporating 2 grades of triplets. Creation of these component parts is described in terms of action-integrals. The gluon field energy holding the triplets together is related to total energy. Uniqueness of electromagnetic charge is attributed to a governing action principle. Finally, a neutron model has been proposed, consisting of a proton core orbited by a heavy-electron.