I had fun with my 10x12 or so listening room, but it turned into an anal nightmare. All I did was obsess over room treatment and placement. If you are serious I would do it (it's worth having a dedicated listening room), but get in touch with Rives to save yourself the never ending tweaking (fun at first - but never ending). I missed a lot of musical enjoyment, because I was always listening to the equipment.
Rob
Rob