Texture size, Textures Format, There is nothing much you can do about project size. What is limiting you size? There is not much you can do about your Models and the size of them. FBX is standard for Unity as the model format. More polygons in your 3d model assets will increase the file size of them but if you want a high graphical game there is not much you can do. Scripts will not effect the project size.
As I said, there is not much you can do bar erase the unnecessary and reduce texture size with different image formats.
Refer to this as well
http://unity3d.com/support/documentation/Manual/Reducing%20File%20size.html
Peace,
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