Yeah, I fitted mine a few years ago. It's straight forward, the "loom" required is only two wires that run from the slip ring to the area by the selector. If you were stuck you could make it up yourself with some wire. I bought mine as a pre-made loom from an online seller.
I rarely use mine, the shift is slow, especially compared to real SMG. I have SMG in the e63. It is something a little different I suppose.