3D Animaton, Digital set building, green-screen compositing

We're shooting an Independent Sci-fi feature on 35mm. We are looking to shoot a Green-screen sequence. This will be one day in a professional green-screen studio. Lit perfectly. We're looking for someone who can build a completely digital environment and ideally composite the talent inside that space. It will be tightly story boarded. We're looking for a partner who can work with us over the next few months to get these shots looking great. We're working on 35mm so there will be some grain matching that will need to take place in the composite arena. The shots will last a total of 7 minutes screen time, however a chuck will be static and locked off. Let me know if you're interested and we can discuss further. But we're realistically looking at November time for this to be done.