I'm working on a proof of concept for a feature film. All the scenes take place in a house--two houses really, but by using separate rooms it'll look like two locations--, a small crew and a limited cast. I'm in Chicago. It's difficult to find a producer at the moment, since I just moved back, don't have much of a network and the industry has a smaller presence. Instead of bringing on another body, I'm considering self-producing again. I figure I'll end up financing some of the film out of pocket, but will keep the costs down as much as possible by offering product placement in exchange for freebies and the like. A DP that expressed interest in the project owns most of the equipment we'll need, outside of boom mics. As a general rule, how much should the project cost?