I know this is an older thread, but I just wanted to share what i've done with some KIA steering wheel controls. I chose these cause they were the smallest and had everything I wanted on the left side of the wheel. I had to cut into the steering wheel a bit, and then I molded some fiberglass covers around it, wrapped those in "leather" vinyl wrap, and rewired everything to work with my pioneer unit. It does exactly what I wanted, it was a very simple bulid, and isn't very big at all. I'll be redoing the covers so they blend more into the airbag side.... but for now, these make me very very happy.
