For me the ultimate extra, either for this or for ROTJ:R would be a short film by Ady about how to get something of this nature done.
Covering the pitfalls, the lucky breaks, the lessons learned the techniques in practice, the team work etc
There are so many films that could benefit from this sort of redressing.
The Alien films loom heavily in my mind here that it would be inspirational for other editors to make a short about the making of revisited.
I love Harmy’s breakdown of the sources of his reconstructions, something of that length and scope would be ideal.