Help please...I'm struggling

Hi everyone, this is my first post, I've tried my hand at designing a studio but the space seems to be a problem, I think my rooms are too small and I'm confused about how to sufficently soundproof my rooms, I've tried using 110mm single layered interior brick walls but creating 2 brick walls with a 200mm cavity where more isolation was necessary, but now that I want to further sound proof using drywall, sheetblok etc...my rooms are becoming too small, what is the best way around this problem? any advice is greatly appreciated and very urgently needed...I have attached a google sketchup file containing the floor plans, thanks everyone :(

it might help to tell us all details about what you're trying to achieve in your studio, what the environment around you is like, etc as per the read me stickie. also, get Rod's book on "home studio construction - build it like the pros" - which deals with a lot of isolation tactics to help you.