Got the idea from here on the forum. The saw buck is 8 feet long, 3 foot deep and 15 inches wide so the bar on my Sears Poulan 42/18 can make the cut. The uprights are on 16 inch centers. The distance from the plywood stop to the first upright is 8 inches. It works good, but I think I will like using my buzz saw better, when I get it running.