I am also serious about growing almost all of my own food and making sure I let at least some of everything produce seed for next year. I am allergic to wheat gluten and it's relatives, so varieties of squash are very important to me as a substitute. I am going to have to give Cushaw's a try! Have you ever tried Butternuts? I like to pick them when they are still so young they have not yet lost their light green skin with the green stripes. They almost look like your Cushaws then. The flesh is so dense and creamy, just wonderful. Now I need to look for some of those Cushaw seeds!