rehearsal room / studio

I am new here thought I would share a design for my bands rehearsal room that I came up with. The black walls are ext and the green would be int with a 6 in air space.( this will most likely change) The int walls will be triple layered with sheet rock(sorry gypsum that is what we call it in CA) and of course insulation. I have not decided on the ext walls cinder block would be cheaper, then say 2x6 wood frame, and from all the data I have seen they are fairly good at blocking sound(music is live rock 110 db). The live room and the control room would both float on a 6 inch concret slab and are independent of each other. Any thought would be welcome,

Here's the picture of it. cheers john

Thanks john for posting the pic.

I have made some changes to the room. The darker wall at the bottom of the drawing is a preexisting wall. I also need a little help on the treatments for the room. Any thoughts? Anyone.