Freelancer:
bakoro
Vinnare
BookCoverPreview_FrontSpineBack
As you asked, here is a mockup of front spine and back. I have marked you the bleeds lines and spine lines. I also put the letters on the spine just to see how it looks. For obvious reasons, it might require some moving around to acomodate for additional text. The back mirrors the background of the front, leaving plenty of room for text.