If you go to our website http://niskygarage.logical.net we use an old 1950's roller and we make cones alot. I generate a cadd drawing to have the kids print out and then they transfer that to sheet metal. fi toy have a way to open a dwg. or a cadd drawing we can make you a template you will need a ploter to print it that big. Just tell us inlet size and outlet size and length of cone.