Rear Body Assembly 

360 full view

Front view of the bottom to hold the bar

side view of cartridge, I later extruded this out to fit two motors.

This is the cap to the cartridge. I ended up finding out we needed a hole for the cap so i ended up making another version of the cap that was modified. 

This is the final version of the cap. I ended up making a hole for the cap since the "fire" or the exhaust to not burn through the cap and safely go out without causing any damage to the rocket car.