In all of the furniture and cabinets that I have made thus far, I have used rough cut lumber in which I prepared the lumber myself. I have on occasion worked with lumber that had already been planed down to size. I am today preparing side panels for a kitchen cabinet in which the lumber has already been planed on one side with the opposite side rough. The boards are at 3/4". Some of the boards have a slight rock when cut to rough length and placed on a tabletop. How would I approach this when gluing up a panel?