When you have the wood attached to the fabric, you need to put more white gun on the wood sides to wrap the wood with the fabric's margins (as you would do to cover a book with paper...).
Now take measures with the elastic rubber band to subject the e-book reader. How to do it? Take the rubber band, pull it a little bit and take the measures of the e-book leaving 2 cm on each side of the rubber which are the sides to be glued... In my case, I need to sew the top rubber band because is wider than the space enable on the top of my e-book reader.
Now, measure the fabric's piece for the interior side of the e-book cover.
Place the blue velvet fabric on top of the inside part of the cover (the non wrapped with fabric), covering the wrapping edges of the exterior side by 0,5 cm or more . Measure it, mark it with the chalk, and cut it.
Now, will have to cut four little holes to pass through them the rubber band.
Present the piece of fabric what will go inside, and mark where the holes will go to the rubber band clamp the e-book reader.
When the white glue are dried (minimum, 1 hour), you can glue with contact glue the "fabric rubber band" sides which go on the exterior sides (or interior, the order is not important, but only one of both sides!).
Put a clamp to firmly subject it. When The contact glue is dry, you can pass through the little holes the rubber band. Now, glue and clamp the other side of the rubber band.
When the rubber band glue is dry (see the manufacturer's instructions), remove all the clamps, put glue on the sides and squeeze hard to paste the fabric of the interior side with the wood covers. Beware of wrinkles caused by the elastic rubber band!