Quote - That's obviously not a tiny project, and I'm kind of wondering if it would be possible in the long run to generate some money with it.

Well the best UV mapping tool is probably headus UVLayout, but it's not cheap. There's also free apps like Roadkill and of course the tools in various modellers. If you make something that can compete in terms of features and/or price, i'm sure a lot of people would buy it.