Continuing with some dimensional information, the attached shows the approximate dimensions of the tripod mount and base. The screw is the same size as that for the 8SE tripod. Hopefully this will help those trying to decide about pier mounting, etc.
While I'm at it, here are the weights of the various components as determined by my digital bathroom scale (so again, take them as approximate values):
Mount only as shipped (no counterweight rod/nut or azimuth bolts): 38.4 lbs
Rod & Nut: 2.4 lbs
AZ bolts: 0.6 lbs (scale results questionable at this low weight)
Counterweight: 17.6 lbs
Tripod w/ hand controller: 17.6 lbs.