Do I need every panel to have its own zipper.
Yes, every panel needs it's own zipper. Marine zippers that separate have a beginning and end. At the beginning of the zipper where it starts, there is retaining box on one side of the zipper. The other side of the zipper has a pin that mates with the retaining box to start the process of closing the separated zippers. So any zipper you use for these panels will need to have the retaining box and pin on the zipper from the factory.
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