I never weighed the parts I made. They are lighter than the OEM pieces though, if that's your concern.
FWIW, I've run the car hard now, and the aluminum bushings inside the spherical ends are holding up fine. I went as far as to pull them out specifically to check for ovalling. None found thus far, but we're still very early in the lifecycle.
As far as needing to cut away the subframe to access the jamnuts, I did that as a convenience more than necessity. I very well could've left things alone and simply removed the bolt to swing that end down out of the way. I'd prefer to do that, as opposed to adding another joint in the center. YMMV