Today I whipped up a cover for my Nexus 7. I FINALLY used my Georgia fabric! I started off with the Kindle cover tutorial from the Whipstitch blog (kind of cool since they're sort of an LQS for me...if you live near Atlanta, they're all considered an LQS even if it's an hour away!).
All 8" dimensions were changed to 9". So your big pieces were 12"x9" and your smaller pieces were 6"x8". I had originally cut this fabric out to make a laptop cover so I had already used some iron on fleece on some of it. I used one of these pieces to cut out ONE of the 12x9 inch pieces. I interfaced the other piece. I followed all construction instructions until I got to the part at the end where you have turned it inside out and are about to sew it closed with a topstitch. Just for the heck of it I closed it up at this point to see how I liked it. I didn't. The top was too soft to me so I decided to add some structure to it. I used some really hard cardboard (an old box Christmas cards came in) to cut out a piece about 1/8 to 1/4" shorter than that height of the left side, and about 3/8" shorter than the width between the left edge and the center. I slipped it inside and topstitched the left edge closed. Then I positioned the cardboard piece as far over to the left as I could get it. I stitched a line (you can see it in the picture) as close to the right edge of the cardboard as possible to keep it from shifting. This left me with about 1/2" in the middle; this makes sure the top cover sits flat on the device and isn't tilted.
This picture shows the pocket. Look close and you can see my ear phones tucked under there. The only thing that worried me about this design versus elastic edges around the device was that I can't reach the on/off switch, or the ear phone jack. But I figured out quickly that is wasn't a big deal to just pull one edge back as needed.