First of all, big kuddo's to John e.a. for putting up this great forum. I truly think it is the best in its kind.

I am currently planning the design of new, small home-studio in my backyard. I think I am in a good position since I can build it up from scratch. The only downside will be the cost, but, hey, this probably will be a multiple year plan anyway.
So, while I am not completely new to acoustics (I am an electronics engineer designing audio equipment for a big consumer electronics company), I still would like you help in designing my small studio.
Currently, I know only the following constraints.
The length of the new building cannot exceed 8m, the total surface area should be minimised as much as possible and the height should not exceed 3.5m. Those are the regulations in my area for what is called a garden building.
Knowing these constraints, I started with an area of 8m x 5m. I also experimented a little with the rooms and came to the follwing design (see drawing).
I intend to use floating floors and I want to construct the walls with drywall, but details of the construction are for later. Oh, the other walls will be brickwalls, another regulation here. But that's good anyway.
Many thanks in advance for your help.
Berre