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A better (?) -- more feasible -- step might be to post around on your location's reddit, craigslist, whatever stuff like that you have access to, looking for someone who's in desperate straits for whatever reason and really just needs a roof for a couple weeks. Grabbing the nearest homeless guy might accomplish the same thing, but it might not work well. If you can at least get a friend of a friend or some slight personal connection, it'd be safer and easier. Just a thought.