An advanced imaginary-gamma_t lattice for the Fermilab Main Injector is examined for its response to quadrupole field errors, quadruple misalignment errors, as well as its dynamical aperature. We find that the lattice it tunable except near an integer tune. The misalignment sensitivity factors are acceptable and can be lowered if the low-beta triplet quadrupoles are specially aligned. The dynamical aperature is very large provided that a family of harmonic sextupoles is installed.