Thanks for the comment on the zipper leads. I was debating on adding them. My leaders are gridded, which helps. If yours are not, I would take a sharpie and a ruler (and a cool drink) and measure from the rail X inches and make a mark. Do this every 3-4 inches across the leader. this will give you a starting line that is even with the rail to pin to. You can purchase separating sleeping bag zippers and add them to the leaders at a later time.