First step in the customization was replacing the Broken and missing Trap door. I used parts from a G1 Optimus Prime trailer in my repairs. Before anyone goes "How could you destroy a G1 Trailer?!" The previous owner had already destroyed it and I had just bought it for parts. Fortunately for me the piece that opened the door was still inside the trap so it was just a question of drilling it out and inserting the metal rod. The cable that allows air to flow into the trap is also cracked and that'll have to be replaced as well.