Because no one else was doing it! Also my first mod ever!
I made an effort to make them as generally usable as possible but please note: These are NOT designed to be clip-free. Notably, with male elezen, some head combos (mostly with mouth 3) do not contain the teeth correctly and will clip despite repeated attempts to prevent this.
Also, original shape data is technically not intact. While vanilla customization seems unaffected, sculpts are likely to break along with any custom normal maps you have.