An old soft top, makes a great pattern for a new one. I used my old Kayline for a pattern, and convinced my wife to sew me up a new one. I added side zippers, so the panels can come off instead of rolled up.
That is what i was going to do with mine. Do you remember where you got your fabric and stuff from? I have not looked into it to much yet, but I would imagine finding some quality waterproof fabric that will hold up will he hard.