After Lee's passing, Raymond Chow demanded that Warners give him the Henry Wong Footage. Raymond wanted this footage as soon as Lee died. So why didn't he cash in on this footage - it's rumored to feature Lee's on set fight with an extra and be 5 hours in duration. If that's not worth a lot of money, I don't know what is!
No word on the sister auditions. Do you really think there isnt any more outdoor photos? Interview original cast/stuntmen/crew is my suggestion before writing any book!