I hate to be the thorn in the side or the pain somewhere else, but Wings 1.4 does no longer have a true mirror function, although I swear I saw it in older versions.  Meaning, do half a head, say the left side, select, hit "Mirror", and the right side would appear.  And I'll swear Wings used to do that.  IIRC, the popup used to give a choice of "Mirror" or "Mirror and create new object."

The "I" in Doric is Silent.