It NOT KO. I used spare figures, toys. For the connection points, the SR 71 parts, i used a spare ROTF Leader Jetfire. The turbines are came from an old broken toy (Anakin Skywalker pod from the first episode of SW) what i bought from a charity shop. The turbines are rotateable, and removable, because they have rachet joints. I will give that joints for the trailer as well, and the turbines will be comlatible with the trailer. I will give some vires, a great paintjob with black, silver gunmetal cooper and gold. I hope everything will be ok. This is my plan for the backpack an my version, because i didn't found the original one for me