too. You are welcome to sell finished products!
If you are using a filler for the pages and have selected a thicker fabric, don't put the filler down the dotted gray line where the final binding will be sewn. The book will be too thick to fit into most sewing machines! You will also need to "hand crank" the machine over some of the thicker parts if you are using a heavy fabric like canvas, denim, or twill.