Most required mathematics exists, but it must be brought in proper coherence. Physical reality applies a coherent piece of mathematics.
In nearly all approaches, I miss the efforts of Garrett Birkhoff and John von Neumann to establish a fundament that emerges into a suitable modeling platform. In their 1936 paper, they introduced a relational structure that they called quantum logic and that mathematicians call an orthomodular lattice. It automatically emerges into a separable Hilbert space, which also introduces a selected set of number systems into the modeling platform. Hilbert spaces can only cope with division rings and separable Hilbert spaces can store discrete values but no continuums. Each infinite dimensional separable Hilbert space owns a unique non-separable Hilbert space that embeds its separable partner. In this way, the structure and the functionality of the platform grow in a restricted way. After a few steps, a very powerful and flexible modeling platform evolves. This model acts as a repository for dynamic geometric data that fit in quaternionic eigenvalues of dedicated operators. The non-separable part of the model can archive continuums that are defined by quaternionic functions.
In other words, the foundation that was discovered by Birkhoff and von Neumann delivers a base model that can offer the basement of well-founded theories and that puts restrictions on the dimensions which universe can claim.
Multiple Hilbert spaces can share the same underlying vector space and form a set of platforms that float on a background platform. On those platforms can live objects that hop around in a stochastic hopping path. This adds dynamics to the model.
The orthomodular lattice acts like a seed from which a certain kind of plant grows. Here the seed turns into the physical reality that we perceive.
Stochastic processes generate the hop landing locations and characteristic functions control these processes. These characteristic functions are the Fourier transform of the location density distribution of the hop landing location swarm that represents the elementary particle.
This delivers the holographic control of these elementary modules. Also, higher level modules are controlled by stochastic processes that own a characteristic function.
See: "Stochastic control of the universe"; http://vixra.org/abs/1712.0243 Indirectly via the characteristic functions the universe is controlled in a holographic way.
The Wikiversity Hilbert Book Model Project investigates this approach.
http://vixra.org/author/j_a_j_van_leunen contains documents that treat some highlights of the project.