New layout for home studio ??

This is the layout I will have in my new house , the control room is in the garage. I would like to know where to put the bass traps and absorbing materials in this room. It was designed using the golden ratio's ( exact measurements not on the dwg) Any help would be appreciated Thanks Buzz PS: the desk will be rotated to the right wall facing it , with a window into the guest room , and a door also ( sorry the dwg is old )

Maybe this will help - http://www.johnlsayers.com/HR/index1.htm

Thanks Knight thats almost exactly the room setup I will have , good info Later Buzz PS: I'v been looking at using a round arc bass trap at the back of the room for better low freq. dampening ( covers a wider range of freq. ) Any feedback on this