new studio...based on Small Studio in 3D

I am going to start building a small studio for personal use, and occasional recordings of bands. I want to base my design on the Small Studio in 3D that John designed and put on this forum. It is located at http://www.johnlsayers.com/phpBB2/viewtopic.php?f=1&t=5457 The space I have is almost identical to this including the doorway to the outside. I want to add another door on the opposite wall also. I will be building this in half of my storage building (made of logs). I would like a door on the opposite side of the studio, as well as the doorway that is currently in the design. That way I can get to the studio from outside or from the inside of the other half of my building. Where do you suggest that I put the door and keep the best possible sound? I have the same size area to work with, so feel free to re-design for what I need. Thanks in advance guys. Jason