My guesses on what we’re looking at:

• The big sketch in the middle has got to be the stage with various characters (I count 5 on the stage).  Behind and above them are two more figures, whom I think are some combination of Giovanni, the Commendatore, and/or the conductor.
• On the bottom right is likely the Don himself
• On the top right is . . . I have no idea.  One of the women?  The statue of the Commendatore? Some other part of the set?

Gehry’s sketches make total sense to me once I actually see what is built, but at this phase, it’s a bit tougher.  Perhaps some of you have a better sense.

(Image courtesy of the Los Angeles Times)