I realize that not everyone will have the time to do this the way it should be done but I don't think that writing such a document is a waste of time in any case.
If you have a good idea, putting that idea to words and images is always a good thing. It clarifies what advantages or downsides project has and if it's original and interesting it doesn't matter if it will be accepted here and now.
With original, simple and interesting game concept, written and backed with 3D & 2D art, I'm sure anyone can find team members willing to give it a try.