Thanks for the info Bob. 6Sxx was the numbering scheme I'd been referred to in regards to smeagol. In fact, I was at CompUSA a few hours ago and confirmed the same build number on a demo G5. I asked the tech there if the machine was a demo or not. He indicated that it was the production model...
My understanding is that there are two distinct flavors of 10.2.7 - Black Rider for non-G5s and Smeagol for the G5 only. So if you try Smeagol on an older machine (such as a MDD) it will fail to install. I know the build numbering scheme is different as well. The only build number I could see...