And, since Dave Tess isn't selling his time as a studio designer, I wouldn't think he'd mind (How 'bout it, Dave?)
Main thing when building is to follow the basic rules for sound isolation (unless it isn't a problem in your area for either you or your neighbors) - The sticky section has lots of useful info on this... Steve
if you have time, I have a question about the walls (the grey in the picture, also inside the other walls). do you think it is essential that these walls are of concrete or can it be of made of wood?
Daniel, they can be made of wood if it's done right - multiple layers of gypsum wallboard on either wood or steel frames is one of the better ways to build walls. Check out the "sticky" called "complete section" for more details... Steve