A lot of Steve's patterns are fitting wood into slots. I recently did a box from one of his patterns and whereas he typically uses 1/4-inch for his slots, the wood I was using was measured in millimeters. I had to modify my pattern to the thickness of the wood. I cut the slot a little tight and then sanded to fit. As far as the circles, if it were me, I would either cut them on the scroll saw just to the inside of the line and then sand to the line or use a forstner bit with a good, solid back to prevent tear out.