I also don't think the speaker shelf would be stable enough on the thin profile TV. Any litte movement on the TV stand would topple it, I think. The kinect on the tripod mount is a cool idea. I agree with tomtuttle's option number two. I'd mount the 150 on a stand. Maybe get bracket steel (like they hang garage door openers on) paint it black, use the mounting hole on the back of the 150. You could even adapt a clamp to the bottom of the bracket and clamp it to your existing table.

M22v3;VP150;QS8;Hsu VTF3-MK4 sub