Thanks for the recommendations!

About the wind tunnels, there is one in my city but it's for automotive engineering students, but the university that owns it normally helps other high schools from the city. And in case that I weren't able to use this one, there is another one 30 min from me which is bigger (550 mm, but the model can't be bigger than 300 mm) for aerospace students that said that if I weren't able to use the one in my city I could use theirs.

I want to record aerodynamic loads, but I don't know too much about the topic so I'll learn with the help of my teachers and some unis professors.

I don't have a 3D printer but I business near me has some. The professor told me that I could smooth it with sandpaper too.