SCOTCH is ALWAYS GOOOD!!!1Fast68, another consideration here than may have slipped past you is that the sides are NOT a square plank. The longitudinal edges are curved.
If you make a 10" side from one piece of wood with square corners, it's going to have to start out wider than a finished 10".
If you already knew this, then I'll quietly go back to my glass of scotch. (In fact, I think I'll do that no matter what you knew or didn't.)