GC exclusive? That explains why there's no mention on the Gibson site. I think you could add another knob in the correct position. The cavity cover on the back looks stock. The finish is "just got sick" ugly. A little green. For some reason, I kind of like it. So un-guitar finish looking.
I picked up one of these guitars from Dawsons Music in Leeds, England last April. Really nice guitar. I played it alongside a "proper" SG and preferred it as the finish on the neck was less sticky, and it was cheaper. The salesperson told me it was so cheap due to the lack of bridge, one less tone pot and you get a gigbag rather than a flightcase. Mixed with a set of Ernie Ball Heavy Top Skinny Bottom strings, this guitar sounds the beast!