The pilot indicated that he performed a normal preflight inspection of his airplane, loaded baggage into the back seat, placed a canvas canopy cover on top of the baggage, and proceeded to takeoff. The pilot had not securely locked the canopy into the closed position. After accelerating to about 70 mph, the canopy partially opened, and the canvas cover exited the airplane. It impacted the pusher propeller and a blade shattered. The pilot aborted the takeoff, but due to vibrations the nose wheel broke off before he was able to stop. During the sequence, the airplane was substantially damaged by the fire. The pilot opined that a fuel line broke due to the severe engine vibration or an impact from the nose wheel.