Collaborative design website?
Instructables is mostly for publishing instructions about how to build something, but the design for the thing being built already exists.
Is there a site for collaborative design of the thing being built?
For instance, I want to propose an idea, describe what I've thought of so far, and then get help designing the parts I don't know enough about. I'm good with electronics, for instance, but bad with mechanical engineering, so I'd write up what I could about my idea, including electronics, and then request help from a mechanical expert on the rest. Others could propose different ways of doing the same thing, etc. Just posting in a forum or something isn't really good enough.
Does anyone know of a site like this?