That would be awesome! I love warrior cats and would love a warrior cat mod. I have been searching for one for so long and have not found one. I wish I knew how to make mods, and if I did I would have made one.
I really want this to happen! I love the warriors series and if i could, i would help you, but i know nothing about programing. But i am taking a programming course in high school next year, so maybe i could help you then.
Suggestion: You can pick adventure mode or story mode. Story mode will start in the forest, and follow the events of the main story. E.g. You will start as rusty, and then become firepaw, ect. If you die, you have to restart IF you havent become firestar yet. In adventure mode, you chose what place to start out in (mountains, forest, lake, some other one that would be created) and then random events will occur (greencough breakout, clan invasion, dried up lake), and the character will have to deal with these issues. When they die, they get reborn and continue where they left off.