I saw one writeup on SLKWorld on a 'buttoned' steering wheel, but it looked like a mess. Do you have a link?

I put out a request on MBWorld for someone with any 2008-16 model MB with steering wheel controls in my area, so that I could hook up my equipment and snoop on the bus. One of the things I said I'd do is to publish all of the information for the community as a whole. If you are in the FL panhandle or surrounding areas, and you'd like to help, I would love to talk to you.

As for a kit, I'm not sure I'd want to do that, as support gets to be more than I can deal with. There is a member here that offers a turnkey kit to add paddle shifters to the existing CF steering wheel. It's a great option, and one I was considering myself, before wanting all the buttons. I have also considered simply re-wiring the W205 wheel, and adding my own communications stuff to it, but I really don't like that idea.