I would love to provide some insight but absolutely has no experience with sailmaking. But if you post your question in the help section, many folks will chime in for sure.I am going to follow his recommendations on sail making for my BN and not fold the fabric over taking it out of scale. My hesitancy is in how to stabilize the fabric to accurately draw the sewing lines without fouling the sewing machine. . . open dock for recommendations on this one. Rich