I figure people do! It looks great, it does look like an official alt. Yeah, she made mods too. There was an ask thread posing the question about a Sims in Smash Bros., and, well she's planning on responding to that.
It's a lot of work doing the rig (skinwrap in 3DS Max saved time) and making sure the materials display properly (as well as editing textures to make sure the colors are consistent). And I'm not done; I need to do UI.
yeah well you don't have to understand it. it's... magic! a lot of pain was experienced during the process however!