I think you're right on the bed weight. I'm guessing 400-500 lbs, but wouldn't bet on it. I wouldn't to lift one end either and that's why I'm hiring riggers to do it, or at least to move the pieces. I don't trust them to disassemble or re-assemble it.
Looks like Tormach has a rough 3D CAD file of the SBL lathe with components that can be broken out. Maybe I can use that with my CAD program (GeoMagic Design) to get an estimate of component weights.
Mike