Not to crush your spirits or anything, but there have been about 3 other Community projects recently - all of which were unsuccessful in the end. Community projects aren't structured very well at all, and leaves each individual with less motivation to continue contributing. The easiest thing to do is to form a small dedicated team who can contribute at a consistent rate.

From watching others try this route, I am just advising you what the outcome will most likely be. Add in the factor of how many Indie developers actually complete a game as a team, and the percentages are even less for a community project.

I hope to see the best for this nonetheless, good luck!