The realization space is
  [1   0   1   -x1^2 + 1   0   1    1    0   x1    1               x1]
  [0   1   1       -x1^2   0   0    0    1   x1   x1             x1^2]
  [0   0   0           0   1   1   x1   -1    1    1   -x1^2 + x1 + 1]
in the multivariate polynomial ring in 1 variable over ZZ
within the vanishing set of the ideal
Ideal (-x1^9 + 3*x1^8 - x1^7 - 3*x1^6 + 2*x1^5 - x1^4 + x1^2)
avoiding the zero loci of the polynomials
RingElem[x1, x1 + 1, x1 - 1, x1^2 - x1 - 1, 2*x1 + 1, x1^3 - 2*x1^2 + x1 + 1, x1^3 - x1 - 1, x1^2 - x1 + 1]