Sea Dogs and Kayazy Assassins + Eleminators
Nomad, Rocinante, Rover/Mule/Nomad (magnets), Driller, Basher and an old Khador Jack meant for conversion.
dwarf themed with humans/elves as slave units and Warjacks for the larger stuff
or going with the Ratkin Slave List as those might fit Humans better than Orcs