I am making an HH clone. Someone amazingly found eight 20 foot seperating zippers for me. I have made a pattern of the bugnet/top cover and it is time to sew. I think it is best to sew each half of the zipper on while seperated. I do have a fear things won't line up in the end. The other option is to sew it while the zipper is attached however that sounds more difficult. I guess I will have to sew through and opening in the zipper. Can anybody with experience here put me on the path to success?