Indeed, this is a hollowed out original. Apparently, it looks cool, and it offsets some of the Sg neck dive, so Trucks had it on his signature model. Kind of odd, but I dig the look.
I wanted to get one of those natural-burst roasted maple f/b SG's a couple of years ago. People seem to be holding on to 'em though, I never see them up on reverb or ebay. I doubt I'd buy one now, unless it was a steal of a deal.
Cool! How's the neck? Most SGs turn me off, due to their typically very slim necks.