Perhaps a good place to start would be Charles Noad, who is usually very helpful with this kind of thing.
Charles Noad put together a fascinating essay - On the Construction of the Silmarillion - included in 'Tolkien's Legendarium'
http://www.greenwood.com/books/BookD...d=1&sku=GM0530. Noad is a recognised expert & knew Tolkien. He also proof read some (all?) the volumes of HoME & knows Christopher Tolkien well . On top of that he's a very nice guy (so I can claim to have had a couple of conversations with a guy who is friends with CRT - how's that for name dropping!!)' who can be contacted via the Tolkien Society, where he's the archivist:
http://www.tolkiensociety.org/ts_info/contacts.html. There's also an address for the Tolkien Estate there.