I recently made the bilgy tent. The "taper" isn't hard at all to cut. You just take a rectangle of the material, measure a particular distance from the right on one end, and from the left on the other end. You then cut a straight line between the two marks. As far as the triple seam, you sew the mesh to the roof, then the overhang to the two. It's not the easiest thing in the world, but it's not all that bad.