1) Cut the 15 yards in half, to get 2 pieces about 22 feet each
2) Use a flat felled seam to sew the two together lengthwise
3) Mark and cut the six triangles, keeping the seam exactly at center, knowing that they'll be cut in alternating directions (will have some waste material...good for stuff sacks!)
4) Sew the long edges of each triangle to another using a flat feld stitch
5) For the last two, sew the YKK zipper to either side. Look at your existing tent to see how the material is folded at the zipper.
6) Hem the bottom
7) At each of the six corners, sew in a loop of polypro webbing and cover with a circular reinforcing patch, about 6-inches from the PU4000.
8) Add a conical reinforcing patch at the peak, sort of a pocket for the trekking pole to nest in.
9) Set up the shelter inside out, and seal all seams with Seam Grip
Setting up the shelter and getting the distance right can be a challenge, made easier by cutting a Tyvek ground cloth to shape, about 3/4 of the inside floor. Add loops that connect to four of the stakes, so that the shelter goes up quickly when tied to those four points.