[SPOILER ALERT] Resizing a character appearance.

I'd like to use the appearance of Melissan, the one she has during the final fight in ToB. She has a great look and really nice fighting animations. I can change the appearance with EE Keeper without problems. The problem is she's so big, she gets stuck in doorways and small stairs.

Is there a way to modify her size ? Or maybe modding an item similar to the big metal unit, changing the appearance to Melissan instead of an iron golem, would be an alternative ?