So basically like a localbitcoins.com 2.0. It would work in a similar way, with some additional features but the main difference is that it would support not only bitcoin, but a few other cryptocurrencies as well, like 7-8 currencies, the most established ones.
Do you see a demand for such platform? Would you use it?
It looks like a very interesting project, but as OmegaStar said, you will need some advertising. I could help with that.