modeling (alter shapes)

so, ive been playing a tron game build with unity, and i was always wondering how they made the wheel well of the light cycle. how can i edit shapes like that?

from what i figured, it was basically a cylinder parented to two spheres. how would i drill a big hole threw a shape?

Unity is game engine. It has nothing to do with modeling. However you can model something in another program then import it into unity so you can use it in your tron game.

If your looking for a free modeling software I suggest Blender3D. This site has lots of tutorials to get on the right track.