I wonder about the balance. Zebra is significantly weaker than Knight on 8x8, but that is because it is so clumsy, and gets easily trapped because most of its move fall off-board. But as a compound with stepping moves I am not so sure. The steps restore good manouevrability, and the Zebra moves can be very dangerous because of their long reach, which allows them to attack behind Pawns without getting in their reach. The Charging Knight (fhNbsWbF) is significantly stronger than a Knight, and the Charging Zebra might be similar or even better.
(Furiously taking notes...) ;)