Your room sounds very nice and well thought out. I would add a water spigot to the room, maybe a separate electric circuit to make turning everything on and off quickly, possible. Just a thought...why are you using a grow tent when you have a dedicated and sealed up room that you can really crank things up. Without the tent, you get a lot more headroom for growing taller plants, which can grow a lot from side growth. It is just a thought. I guess a tent is a lot easier to mess with stuff and is easy to set up and take down. My grow area is about the same size as yours, although I don't have it going as a perpetual grow. Six plants filled the room to the brim, with some reaching 7 ft despite heavy training.
The time to make a great grow room is now, before you start it. I think you have covered the bases pretty well, although I would keep the ventilation on the bigger side...when things start to flower they are quite odiferous. I can't comment about a scrubber as I've never used one, but things get stinky indoors. Great Job...keep up the good work!