I got to molest that set back in January. It is a work of art. I have to say SI-D is definitely one of the top tier manufacturers in the AR game... right up their with LaRue, LMT, KAC, and LWRCi.
I thought about building one when I first saw it, but I'm still happy with my current SI-D.
What's your plan for this? Long range? Hunter? Ninja weapon?