Sew the six folded-in-half sheets together at the crease in a figure 8 pattern.
Make sure you start and end at the same point and the knot faces inside.
Stack several of these six-sheet stacks on top of each other, making sure they are aligned.
Press them down between some heavy books and measure the width of the spine.
Place the book between sheets of wax paper and underneath a heavy book or two.
Wait for the glue to dry.
When the glue dries, take out the book and glue the cardboard pieces to the first and last pages.
Make sure they are aligned with each other and also with the spine.
Cut two pieces of fabric that are as long as the cardboard pieces, and two centimeters wider than the piece of fabric holding the pages together.
Glue these to the spine on top of the cardboard and press them into the first piece of fabric.
Make a crease one inch from the top and one inch from the bottom.
Glue these flaps to the inside of the cover.
Cut the paper so the spine is covered but there is no paper directly above or below it.
You should now have four flaps — two above the book and two below.
Cut out two sheets of paper ¼-inch thinner than the cover and ½-inch shorter.
Glue it to the inside cover so that it covers what the cover paper doesn't, and so that it sits flush to the spine.