Dude, I wouldn't mess with VU at all... not unless you have say, $50,000 financial backing and a full blown game development company behind you. Otherwise,
1. it's a HUGE financial risk, if you want to sell what you're making (which you guys probably don't want, but still)
2. It will reveal OPU to the world and will most likely get us into a lot of trouble, even if you don't mention OPU, they will probably go googling various things and, thus, will find us. They will probably have Levi and Hacker kill the downloads, and if they find that there is a "Backup" which I don't really care for, they will probably sue, and, pretty much, we're screwed.
So, I say, don't go there... I hate being so blunt but .... I don't think we will ever get that source code, it's probably long gone, and I'm 99% sure VU won't give it to anyone for free or for any price under, say, $30,000