The acrylic piece is pretty light. The whole assembly is easily balanced by the counterweight. I got the studio boom at guitar center. They price matched one I found online.
Yep, those are ksm109's. I like them pretty well. I had to return one of the first ones I got because the connector went bad. I used some old rim mount mic clips I had and use the screw clamp to hold the cable in place.
When you want 'real'. As in most coherent (read 'foucoused), least phase cross pollination. Where in a spaced pair you're sort of going for the position and/or making use of the diffuse image. Look up ORTIF. A little tight, a little phase in the upper octave. Sort of half between the two.
torque91 - very cool! If I was looking to buy one, I'd definitely want some holes closer to the center so I could do an x/y setup as well if I wanted to.
Steve Moser - very creative! Looks like the world's fanciest roach clip!