Can $E_8$ unification at low energies be consistent with proton decay?

A model is presented that achieves unification of the full Standard Model (SM) field content into a single superfield. It has $E_8$ as a gauge group and simple SUSY in 10 spacetime dimensions. The extra dimensions are orbifolded such that they reduce the gauge symmetry into the SM one. At low energies, only the SM field content remains with viable unified Yukawa couplings. Unification is achieved at low energies ($10^{6}\ \rm{GeV}$) with controlled proton decay.