Recently I spoke with an architect working in WETA. Although obviously cagey about disclosing confidential information (with penalties not unlike what was outlined in an earlier spy report), they did let slip one piece of info that might interest you.

They disclosed that Tolkien experts all over the world had faxed in (or by any other means for that matter) alot of Tenguar (Elven) writings, to incorporate within the set design. Personally I’m very happy to hear that they are covering such detail as this.