Is it possible to add custom contents in Animal Crossing Gamecube?

[jacopo]

I was wondering if it could be possible to create additional content for this game and how hard would it be to do so.
I have made a few books with pictures in Skyrim and Oblivion and I would love to do the same on Animal crossing, I guess it would not be as easy since TES games are made with mods in mind since the beginning and Animal Crossing is the opposite, but I'd like to hear from somebody more skilled and expert than me just to know.
Thanks