Frame conectors

Just bought the material for my frame connectors, 76.00 for 20 foot of 2x3" boxed tubing, its the only way they sell it and I will only use about 8-10 feet of it. its 11 guage steel (approx 1/8 thickness) a little heavier wall thickness than what the steel used from S&W race cars where Ibought my chassis back half from what gives, what to do with the left over material??