Need help on Pneumatic Air Cannon design!

[DaisyPukes]

Hi everyone!

I'm a junior in high school and a noob about building pneumatic air cannons. For my physics 1 final, I decided to build a pneumatic air cannon as part of my project. I have no idea what I'm doing and was hoping someone could help me with my design and provide feedback on my ideas. Furthermore, I am looking for some great resources that can help me improve my understanding of how to build the pneumatic air cannon.

Below is a design I drew up for what I hope to achieve.

[farcticox1]

Do you have a budget or access to parts. What ammo are you going to use ? I found airsoft a good place to start or even Nerf Rival can give good results with low pressure.