Upshot, I told them that this would mean extra work for me (contractor!) and hence, more money from them. I told them an extra day- Will made me an offer- $300 (an extra day), or, if I get an 8.8 in the review (from a lab that's known for rating really low, even when they like the class- damn engineers), I'll get $500.
I feel like a sell out, but it's a refreshing change from having _no_ money. But the money's not enough to keep me at this forever. I'm going to start shooting applications out to places so that I can get steady work that doesn't involve giving me quite so much stress.