Mounting the molds on the strongbacks is a tedious process. Everything has to be plumb and square and level; which is hard to do since the molds are only attached along one edge at this point. Everything wants to wiggle. Clamps help, an angle gauge serves as a jig to set the 12” waterline to the same height on every mold, and shims adjust the elevation until screws are driven in. Once a batten is tacked along the top, and a few strips are run up the sides, everything will lock in place.