Cardiff: partition walls put up along with windows and doors (ended)

partition walls put up along with windows and doors

I'm putting together a recording studio in cardiff in a detached building of interior floor dimensions 12.4m by 6.2m and is 2.3m high. I need 3 main walls crossing the interior (6.2m long) one of which will need a partition wall coming from it to the exterior wall (2m) to make 2 small storage rooms at the back. 4 doors will be needed internaly 2 of which I would like to be sound proofed to a reasonable level. There needs to be 1 main window internaly about 2m wide by 0.8m high which I would preferably like to be double glass. I would like all partition walls to be filled with rock wool or an equivelant with good acoustic absorption properties. Thanks a lot, Jim.
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