Although this is more to do with post production, it is important to sort this all out now, especially since I'm the cinemaphotographer of the project.
We have all agreed to go with what is essentially the science fiction standard, which is 2.35:1 (more commonly referred to as 2.39:1 and 2.40:1 nowadays). This is used in films to create a wide image of viewing.
A few examples below:
2001: Space Oddysey
In using this aspect ratio, I hope we can give off a cinematic feel to the piece. In usiong the right depth of field along with this, we should be able to get something that truly looks as if it belongs in the theatre.