I might have a picture or brochure of an O'Day 20 that will give you an idea, but rigging it is not too difficult. You have a forestay, backstay two port and starboard upper shrouds and two port and starboard lower shrouds (side stays). Never mind, let me see if I can find some useful info for you in my files. Give me an email address and I will attach what I can find and email them to you.