Well Zero isn't really a clone as he is more of a genetically altered version of Frieza.  If anything I would think of his as a strange offspring attempt, rather then a clone.  He only looks like Frieza until you go down the colors.   Or if you look at his head, his  head spikes are slightly different.    I could have created a race but this seemed like why not?  

Like it seems pretty do able.  At least it isn't an exact metal clone of frieza that was created by a star that a certain family member of frieza did to himself and made hundreds of...