Fluorescent spray cans and brushed acrylics are excellent for that purpose. Struts can be of any strong, light material, but I prefer the economical, ribbed Screen Door Molding , available at the same stores as above. Start on one side of the kite and end on the other, making the loops themselves about 4 in diameter. Fold the loop material in from both edges to provide a dense, smooth tie for the bridle lines. The bridle itself is at least three times as long as the kite is wide, in this case about 30 long.
Short bridles cause instability.
Ensure that there is no twist to the bridle to wind up during launch or low wind, and that the connection point to the fly-line is at the exact middle. Line MUST be kept on a winder adequate to the task of belaying and winding heavy line safely. Do not even think of using a fishing reel. This can be quite difficult in a good breeze so keep the kite rolled up until all is ready for launch. Large area kites are very efficient, so no running is required.