I know what most people will say just to adapt to the new / current versions of the Naga. I believe the circular pattern is best due to how they positioned the side buttons so that when gripping the mouse it prevents your thumb from accidentally clicking any of the buttons.  The original Razer Naga to the Naga Hex & Trinity all had this button layout.  If anything at least make an additional side plate that will be compatible with your new Razer Naga Pro V2.