  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 ten spacetime dimensions. The extra dimensions are orbifolded
such that they reduce the gauge symmetry directly to the SM one. At low
energies, only the SM field content remains with viable unified Yukawa
couplings. Full unification can be achieved at energies as low as $10^6\
\rm{GeV}$ with controlled proton decay.
