Okay, I've got my third and hopefully last design finished. Please comment on it! I haven't placed any acoustic treatment in my design, I hope you guys can make some suggestions. I'm at street level and have a concrete floor. The part where the drums are is a dampened floor, I don't know what materials have been used, I guess the drums won't need an additional raiser. If you want to know the measurements, you can check them out in the sketchup file!
External image, not preserved — original: http://xax.quarin.net/uploaded/studio31.jpg
External image, not preserved — original: http://xax.quarin.net/uploaded/studio32.jpg
http://xax.quarin.net/uploaded/studio3.skp