I've added you
I have the group set to private to stop people that aren't translating from reading any translated parts of the book before it's finished. I hope you don't mind this too much.
Hmm...I can't seem to access it. There are two underscores in my username.
Considering the tiny population of people that have even heard of Toki Pona, I don't think you'll have much of an issue with outsiders looking in. I really think it'll be more of the opposite problem. But if there's enough people, then I suppose you're all set.