It would require a good number of decent voice actors, all having some decent recording equipment or living in the same area. Recording something like that from multiple locations around the world would be tough. For a project like this, it would be preferable to have all the actors in a single location acting together. If anyone has ever heard a fan made radio drama, they are pretty much one of the most painful things you can inflict upon your ears. This is a cool idea, but it would take more than ambition, willingness, and equipment to carry it out, it would need some decent talent, otherwise it would just be a waste of time.