russs15 said:

I was trying to do a potted history of where we were to where we are now. To do it properly would need a book writing.....

What was a mystery is now taken for granted and dozens of people have got us to this place.

Agree russ, this forum is a fantastic resource for info about the history of these films, many things regarding these films have been uncovered by fellow SW-freaks on these boards over the years. If you have a question, there's almost always someone who have an answer.