Yeah, it kind of caught me off guard how big it was too.
I haven't updated this thread because there didn't seem to be much interest in the boom arm, but I'll copy some of the pictures from the other forum.
I mounted the boom arm to the concrete wall that supports the floor of my garage, which is above the "machine room" of my workshop/basement.
It can sweep out an arc that reaches across the whole assembly room and a few feet into my machine room too.
I removed the rigid downtube that normally supports an energy box and installed my plug-it/vac hose. I also added a quad-box pendant outlet with one side for unswitched power and the other side for vac-power (triggers the CT vac). I'm going to mount a couple of hangers on the side of the arm (not shown) to hang an air hose and small extension cord. I also picked up a tool balancer to pull the loose end of the vac hose up off the floor when not being used.