Texture mods for AoEIV?

Is it currently possible to make mods that change unit textures? Say, for example, I wanted to change the texture of the Malian Sofa units so that their horses have zebra stripes (my reason basically being the Rule of Cool). What would I have to do to set up such a mod?

Is it even possible to make texture or skin mods for units in AoE IV using the Content Editor?