Unification of Spins and Charges in Grassmann Space?

In a space of d(d > 5) ordinary and d Grassmann coordinates, fields manifest in an ordinary four-dimensional subspace as spinor (1/2, 3/2), scalar, vector or tensor fields with the corresponding charges, according to two kinds of generators of the Lorentz transformations in the Grassmann space. Vielbeins and spin connections define gauge fields-gravitational and Yang–Mills. For d = 15 the theory offers the unification of all known charges — spins and Yang–Mills charges — of fermionic and bosonic fields and all known interactions.