I would like to make a Bible cover out of one piece of leather, with the inside having "pockets" that the book covers slip into to keep it from sliding out. I like the stiffness of 9/10 oz leather but will it flex enough to let the book close properly, lay flat, and then not spring back open when closed? If not what weight leather should be used? Also, I suppose the inside pockets should be somewhat thinner leather to allow the book to fully close, so what weight would this need to be? Thanks in advance.