I put 2 pages per piece of pellon, and then doubled it over. Each piece is half the size of a sheet of typing paper.
I sewed 3 pages together at a time on the cut ends, and then sewed those pieces together. The cover is a piece of quilted material that I sewed seam binding around. I opened the sewn pages up to the middle, then centered the pages on the cover, sewing in and out to sew the pages in up the back of the "spine" of the cover, making sure that the stitches showing on the cover were small.