New studio being built. Advice on control room most welcome!

Hello I'm a producer/engineer currently building a studio with a couple of other people and I'm just looking for some advice on getting our control room sounding right. I've just seen an acoustic designer called Andrew Parry and he's been very concerned about our idea for the back of the room. He says it will create a nasty focal point around the area of the room where we'll be sat listening/mixing! I've attached a jpeg and sketchup file of a model i've done is here http://www.timgmusic.co.uk/bridgewaterstudios/bridgewater%20studios.skp (right click save as). It's all to scale. Any advice on the layout of the room would be most welcome! We're half way with building work so it's not a complete disaster if we need to change things as we've only got the stud work up at the moment. The room ratio seems quite good at the moment (632cm x 536cm) and we've done slightly angled walls on the left and right hand sides. the roof also consists of 2 arches (starting at 248cm high going up to 268cm). So theres an issue there with focal points being created vertically. We don't want to build a false ceiling really as there's lights and sprinklers there. We'll have to work around them when doing any treratment to the ceiling. I haven't put the speaker housing in the sketch yet but we're planning to put them at the opposite end of the room to the sofa to keep the room symetrical. Any advice/thoughts/comments would be massively appreciated! cheers Tim

the concave bits need to go. it will focus the sound and cause you all kinds of grief. if you cannot remove them, fill them or use a poly diffuser over most of each one - you can get clear material for it. extend the lights and sprinklers as neded. you're going to want to re-size the soffits (assuming thats wat the angled line is under the arches) as well since they're too wide. make the center space bigger and put some absorption or diffusion there. make each soffit about 1.25-1.5m wide - depends on your monitoring system. it looks like the door and window on the sides are straight as opposed to angled with the walls. the doors on the booths will reflect right back at the mix position and either need new angles or absorbers on them. the pole in the middle needs some absorption. Mr. Perry is right to be concerned...