How is the cellphone connection, if any, where you're planning to sleep? A cellphone could be a useful emergency communication device if it can function.
The other question is how general will be peoples's awareness that you are planning to do this? If "everyone" knows it might attract a predator, but "your friends" may also function as a protective shield. If "no one" knows, you might be the victim of a more random attack, or not.
It sounds to me like a good way to learn more about how it feels to be "homeless" but it's also useful as someone who is not "homeless" to think it through, which I believe you're doing a good job of.