i would also be in, but only if i can identify with the story and aesthetics in some way, and only if there's a talented and experienced director having the final word on everything. having something like votes on important decisions will lead to a nightmare.
i've worked on community projects before and have a rather bad experience, people being too kind to each other and approving low quality work from participants just too keep the "good vibe going". if something is not good, people need to be called on it, regardless if it might hurt their feelings. otherwise the outcome only can be a pile of .
also i would suggest to keep it really short, something around like 3-5 minutes. the shorter it is, the higher the possibility of delivering a top notch piece and being able to finish it.
i could help with character design, modelling, texturing, rigging, animation, lighting, comping and sound design. the time i can dedicate of course depends on my work load and how much i'm into the story and mood of the project.