Custom ability icons, hero model change into a normal unit?

[Burut]

Doesn't seem to me like it is possible to create custom ability icons because I found the png files that contain the icons, and it's just bunch of icons piled up in one place. Changed the color of the icons (Hue) and the change was visible in game, but I don't have an idea how to change it. Noticed they are marked with BA1 in unit data files. Also was wondering if changing the hero to another unit is possible (under hero I mean Amelie).