A model rocket

This is the entire rocket put together but I designed it to be modular so students can learn about how center of gravity and small design changes can affect rocket performance and functions. One would print the sections out, use a long threaded rod with nuts and washers to hold the sections together. I was inspired by the new submarine classes and NASA with modular units to outfit a smaller fleet for multiple missions thus reducing cost for missions. I have never done the tube fins before so som