IIRC, the reusable parts are the elevator cores and end flat parts. The idea would be to take out everything above the "platform" in the middle and build up a new podium and towers on either end at some point. Cool idea, but will be difficult to say that it couldn't have been done easier or more reusable in another format (e.g. to your points on including sloped floors etc.)
Looking at the other drawings in the attachment linked to the post a few pages back, the end sections are not flat either, they just have a lower degree of slope.
 
crane going up

177271
 
East elevator core is starting to rise.

IMG_7018.JPG
 

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