When CV started out it was on phpBB. Buzz did some neat tricks with it and it served it's purpose. But as we got a little bigger we switched off to VB. It's out of the box, ready to rock made it appealing. But if you're going to have a license issue then all that's a mute point.
Am I understanding you're going to host this off your own computer? If this is the case I would check with your ISP to see if that violates the terms of service. I have a commercial account with my ISP and get away with murder...