Multible Unit Skins Question

Is it by any way possable to copy a Unit, get two skins for that unit, and give the original unit one skin and give the other unit a different skin?

The only way is to make a custom model and let it use the copy of the skin

Modiffying the model is actually easy just follow this tutorial: http://www.wc3campaigns.net/showthread.php?t=78951

Thanks man, im sure I can figure it out now.