The TOI Platonic groups already improved the SM allowing to explain what fermion generations, quark flavors and the CKM and PMNS mixing matrices are and how to compute them theoretically.After the unification of the fundamental forces, including Gravity,the next step is to remodel Electroweak Theory as a theory of transitions of states. The tools needed to extend the Membrane Theory from Platonic and Archimedian Klein geometries, to account for the nuclear shells, baryon spectrum etc.: modular curves, Belyi pairs, dessin d'enfant and Belyi morphisms.This approach allows to interpret mass as monodromy (curvature of quark fields connection of EM type), introducing many other finite groups: Galois groups and associated tools (Riemann surfaces, divisors, periods, tessentalions, Fuchsian groups etc.).In this way an intrinsic String Theory touches base with the Standard Model.