I use a solid block of wood and use a drill press and router to make mine. I havent made one in awhile but thats how I do it. I would say IMO using a solid block is easier and more forgiving than glueing pieces together. When glueing pieces together, you have to be sure of exact measurements for both the rails. I know guys who tape the left and right rail together to get them exactly the same when cutting on band saw or sanding