I think that writing a book as your final project sounds like a great idea! :D Go for it! As for what language to write it in; how about in French? ;) Just kidding. I think you should write it in the language that you feel most comfortable with, you know? That you feel that you can fully express yourself with or something like that.

I used to feel like the english language was sort of a muse just by it self you know? I get the feeling you're familiar with that too! ;)

Btw, do you have any tips on books that I should read this summer? I feel like I haven't read anything for ages, I'm overdue! 8P