Rudder & centerboard drawings

Barto's plans include scaled drawings of the rudder & centerboard on a 3-inch grid. So I transferred those grids to an AutoCAD layout and printed them full-size on a plotter. It will be easy to transfer these full-size plots to the glued-up rudder and the PVC sheet for the centerboard. After reading Roger Crawford's web site, I thought about how much sense it makes to construct the centerboard from 1/2" PVC instead of plywood with a lead weight, so that's the plan.