A:Answer40 inches long without the speaker stands and roughly 50 inches with it. It has a depth of about 2 feet, and stands 29 inches tall at the desk surface.
A:AnswerYes, it is removable. It actually comes disassembled, so you don't have to put it on in the first place. I took mine off when my new monitor wouldn't fit on top of it.
A:AnswerThe company that makes it says 27 inches, and 40lbs. I have a 29 inch monitor, and used zip-ties to stabilize the slightly oversized base. It's remained staedy despite that unauthorized modification.