Most of this you could get from here

I think most of the things that you have in the description for the website you can already get from Wreckamovie or will get in the very near future:

1) promotion tool

Wreckamovie is a good promotion tool, the custom production pages make it even more so:

http://norwegianninja.wreckamovie.com

2) a mechanism to develop an audience

Wreckamovie is all about developing an audience by collaborating with the community and fans

3) encourage participation from the audience via sharing of ideas and stories

That is exactly what people are doing on Wreckamovie, join http://landing.wreckamovie.com for a great example of this in action. Or any of the more active productions on here to see how this is already working.

4) e-commerce capability to raise funds by sale of associated merchandise

We will launch this on Thursday this week, ie there will be a store for selling production related merchandize like war bonds, t-shirts, frames etc

Maybe you could just have a simple production company website and link to the individual production pages here on Wreckamovie (properly branded for the individual productions) with their associated members and stores for merchandize