I'd like this kind of project to be sucessful, but in these days and times you wont attract much in the way of attention unless you make it commercially viable even at some sort of low level. You will have to find a backer or some financial asistance to really get this off the ground. The reason that sometimes a project like this succeds is because a group of friends who would have normally spent time together, get together and decide to spend time making a movie say rather than playing Q3 on a LAN. Even open source projects such as 3D gamesengines have financial backing or incentives....sure you have the hobbyists who contribute, but its the folks who then go on to make commercially saleable items that really drive those communities, as for the hobbyists, well the talented ones get picked up on the way and usually become employed in those fields. You only have to look at the successful level designers and MOD creators and see how many of them are either already employed by studios or get picked up as soon as their talent is recognised. What I would recommend is that you work out a more detailed plot and work out a financial plan, because most people arent going to give their time up for free. Not a reflection on the people, but on the times.