Would it be legal to use Ripstop Nylon for the bumper cloth if they are the right colors?
R07 -E
E. The BUMPERS must be covered with a rugged, smooth cloth (1000 dernier Cordura Plus® strongly recommended). The cloth must completely enclose all exposed surfaces of the BUMPER backing (plywood) and cushion (pool noodle) material. It is recommended that lengths of aluminum angle be used to clamp the fabric in place.
so if it meets this requirement and the color requirements… i would not see any other rule it would violate.
Rip stop nylon is kind of lite. Check out Duck cloth at Joann’s fabric per Dave Lavery.