Well I think I just wish you all the best. Don't get me wrong, I'd love to see this project become a success, I just have seen too many projects dying...!
For now I just see that from a modeling point of view you already did a bunch of work. That's great. I'm more curious about the programmer's part. Don't underestimate the boredom of working for a long time on the same thing, especially as a coder. Working in huge (I really mean HUGE) projects with a lot of programmers involved I know what I'm talking about, too.
I don't know how many programmers you have and how fit they are. You want to prototype with Unity, that's fine! Actually I'd stick with Unity, using something like Ogre3d might give you more freedom but Ogre is just a rendering engine.
Anyway I will just wait and see and I'm looking forward to your goals and website!