Next season I am going to build the ubiquitous turntable revolve for our stage. The revolve will be an 8 ft radius so the curvature wont be altogether substantial. Usually when I cut circles I reach for a saber saw or a router. However, because of the sheer size of the revolve (2 layers of plywood for 16ft diameter), I am hoping to reduce time (lazy way) buy cutting the curve with a circular saw. I know that a large arc can be cut with a circular saw and have seen plenty of video. I also know that products are made for this (arcus circular saw blade) particular application. After seeing the fore mentioned product I have questions that you may be able to answer. First, have any of you used your circ saw in this way. Second, have any of you made a jig (how) for this application as I would like to make a smooth circle. 3rd do I need a specific blade to cut this arc out of 3/4 ply. 4th any advice?