I'm fairly new to leatherwork, but jumped full in and bought a Cobra Class 4 as a Christmas gift to yours truly. I made a couple of these over Christmas and for the most part did what Paul described, all 2/3 flesh side to flesh side and flaps single 2/3, however, I used black on the inside to give it some contrast. Folds very nice at the spine and lays flat. After it was finished the friend wanted initials and that didn't turn out was well as I had hoped. I played around with some 6 ounce lined with black 2/3, but it was too thick.