Custom Made Sketchbook
Thanks to Hyein, I was able to get everything I needed to make my own custom sketchbook. The hardest part was threading the signatures (set of paper) together. Their are 36 pages of watercolour paper, but I use both sides so I count it as 72.
The cover was done with oils on 100% rag paper. Finally, I can paint in a sketchbook without the paper buckling.