What I think you are referring to are the model limits. A model can only be used by one unit-type per faction, or else the game will crash when a battle is loaded with both unit-types present. However, you can reuse the model in other factions without causing problems. For example the elite phalangite model is used for Argyraspides, Chalkaspides and the Klerouchikon Agema. Furthermore, there is a trick that allows you to reuse models within a faction: designate one of the units as mercs. In the above example: Hysteroi Pezhetairoi have the same model as Argyraspides, but because they are designated as mercs they can exist in the same faction. The downside is that this unit will use mercenary officers and standard bearers (and that you cannot use the model for a real mercenary unit). Off course, if you use the same skin for mercenary officers this won't be a problem, see for example the Roman Camillian Principes and Polybian Hastati.
AFAIK you are going to have to change the skeleton and the weapon as well. Have you checked out the modding forums at the .Org and TWC?
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